/* * Cppcheck - A tool for static C/C++ code analysis * Copyright (C) 2007-2022 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 . */ #include "checkunusedvar.h" #include "errortypes.h" #include "preprocessor.h" #include "settings.h" #include "testsuite.h" #include "tokenize.h" #include #include #include class TestUnusedVar : public TestFixture { public: TestUnusedVar() : TestFixture("TestUnusedVar") {} private: Settings settings; void run() override { settings.severity.enable(Severity::style); settings.severity.enable(Severity::information); settings.checkLibrary = true; LOAD_LIB_2(settings.library, "std.cfg"); TEST_CASE(isRecordTypeWithoutSideEffects); TEST_CASE(cleanFunction); 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(structmember12); // #7179 - FP unused structmember TEST_CASE(structmember13); // #3088 - __attribute__((packed)) TEST_CASE(structmember14); // #6508 - (struct x){1,2,..} TEST_CASE(structmember15); // #3088 - #pragma pack(1) TEST_CASE(structmember_sizeof); TEST_CASE(structmember16); // #10485 TEST_CASE(structmember17); // #10591 TEST_CASE(structmember18); // #10684 TEST_CASE(structmember19); // #10826, #10848, #10852 TEST_CASE(structmember20); // #10737 TEST_CASE(localvar1); TEST_CASE(localvar2); TEST_CASE(localvar3); TEST_CASE(localvar4); TEST_CASE(localvar5); TEST_CASE(localvar6); 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 #3603 TEST_CASE(localvar42); // ticket #3742 TEST_CASE(localvar43); // ticket #3602 TEST_CASE(localvar44); // ticket #4020 TEST_CASE(localvar45); // ticket #4899 TEST_CASE(localvar46); // ticket #5491 (C++11 style initialization) TEST_CASE(localvar47); // ticket #6603 TEST_CASE(localvar48); // ticket #6954 TEST_CASE(localvar49); // ticket #7594 TEST_CASE(localvar50); // ticket #6261 : dostuff(cond ? buf1 : buf2) TEST_CASE(localvar51); // ticket #8128 - FN : tok = tok->next(); TEST_CASE(localvar52); TEST_CASE(localvar53); // continue TEST_CASE(localvar54); // ast, {} TEST_CASE(localvar55); TEST_CASE(localvar56); TEST_CASE(localvar57); // #8974 - increment TEST_CASE(localvar58); // #9901 - increment false positive TEST_CASE(localvar59); // #9737 TEST_CASE(localvar60); TEST_CASE(localvar61); // #9407 TEST_CASE(localvar62); // #10824 TEST_CASE(localvar63); // #6928 TEST_CASE(localvar64); // #9997 TEST_CASE(localvarloops); // loops 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(localvaralias14); // ticket #5619 TEST_CASE(localvaralias15); // ticket #6315 TEST_CASE(localvaralias16); TEST_CASE(localvaralias17); // ticket #8911 TEST_CASE(localvaralias18); // ticket #9234 - iterator TEST_CASE(localvaralias19); // ticket #9828 TEST_CASE(localvaralias20); // ticket #10966 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(localvararray4); // ticket #4839 TEST_CASE(localvararray5); // ticket #7092 TEST_CASE(localvarstring1); TEST_CASE(localvarstring2); // ticket #2929 TEST_CASE(localvarconst1); TEST_CASE(localvarconst2); TEST_CASE(localvarreturn); // ticket #9167 TEST_CASE(localvarmaybeunused); TEST_CASE(localvarthrow); // ticket #3687 TEST_CASE(localVarStd); TEST_CASE(localVarClass); TEST_CASE(localVarSmartPtr); // 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(localvarStruct7); TEST_CASE(localvarStruct8); TEST_CASE(localvarStruct9); TEST_CASE(localvarStruct10); TEST_CASE(localvarStruct11); // 10095 TEST_CASE(localvarStruct12); // #10495 TEST_CASE(localvarStruct13); // #10398 TEST_CASE(localvarStructArray); TEST_CASE(localvarUnion1); 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(localvarDeclaredInIf); 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(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(localvarRangeBasedFor); // #7075 TEST_CASE(localvarAssignInWhile); TEST_CASE(localvarTemplate); // #4955 - variable is used as template parameter TEST_CASE(localvarFuncPtr); // #7194 TEST_CASE(localvarAddr); // #7477 TEST_CASE(localvarDelete); TEST_CASE(localvarLambda); // #8941, #8948 TEST_CASE(localvarStructuredBinding); // #10368 TEST_CASE(localvarCppInitialization); TEST_CASE(localvarCpp11Initialization); TEST_CASE(chainedAssignment); // #5466 TEST_CASE(crash1); TEST_CASE(crash2); TEST_CASE(usingNamespace); // #4585 TEST_CASE(lambdaFunction); // #5078 TEST_CASE(namespaces); // #7557 TEST_CASE(bracesInitCpp11);// #7895 - "int var{123}" initialization TEST_CASE(argument); TEST_CASE(argumentClass); TEST_CASE(escapeAlias); // #9150 TEST_CASE(volatileData); // #9280 TEST_CASE(globalData); } #define functionVariableUsage(...) functionVariableUsage_(__FILE__, __LINE__, __VA_ARGS__) #define checkStructMemberUsage(...) checkStructMemberUsage_(__FILE__, __LINE__, __VA_ARGS__) void checkStructMemberUsage_(const char* file, int line, const char code[], const std::list* directives = nullptr) { // Clear the error buffer.. errout.str(""); Preprocessor preprocessor(settings, nullptr); if (directives) preprocessor.setDirectives(*directives); // Tokenize.. Tokenizer tokenizer(&settings, this); tokenizer.setPreprocessor(&preprocessor); std::istringstream istr(code); ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line); // Check for unused variables.. CheckUnusedVar checkUnusedVar(&tokenizer, &settings, this); (checkUnusedVar.checkStructMemberUsage)(); } void isRecordTypeWithoutSideEffects() { functionVariableUsage( "class A {};\n" "void f() {\n" " A a;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: a\n", errout.str()); functionVariableUsage( "class A {};\n" "class B {\n" "public:\n" " A a;\n" "};\n" "void f() {\n" " B b;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (style) Unused variable: b\n", errout.str()); functionVariableUsage( "class C {\n" "public:\n" " C() = default;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (style) Unused variable: c\n", errout.str()); functionVariableUsage( "class D {\n" "public:\n" " D() {}\n" "};\n" "void f() {\n" " D d;\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (style) Unused variable: d\n", errout.str()); functionVariableUsage( "class E {\n" "public:\n" " uint32_t u{1};\n" "};\n" "void f() {\n" " E e;\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (style) Unused variable: e\n", errout.str()); functionVariableUsage( "class F {\n" "public:\n" " F() : x(0) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (style) Unused variable: f\n", errout.str()); functionVariableUsage( "class F {\n" "public:\n" " F() : x{0} {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (style) Unused variable: f\n", errout.str()); functionVariableUsage( "int y = 0;\n" "class F {\n" "public:\n" " F() : x(y) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("[test.cpp:8]: (style) Unused variable: f\n", errout.str()); functionVariableUsage( "int y = 0;" "class F {\n" "public:\n" " F() : x(++y) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (style) Unused variable: f\n", errout.str()); functionVariableUsage( "int y = 0;" "class F {\n" "public:\n" " F() : x(--y) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (style) Unused variable: f\n", errout.str()); functionVariableUsage( "int y = 0;" "class F {\n" "public:\n" " F() : x(y+=1) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (style) Unused variable: f\n", errout.str()); functionVariableUsage( "int y = 0;" "class F {\n" "public:\n" " F() : x(y-=1) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("[test.cpp:7]: (style) Unused variable: f\n", errout.str()); // non-empty constructor functionVariableUsage( "class F {\n" "public:\n" " F() {\n" " int i = 0;\n" " (void) i;" " }\n" "};\n" "void f() {\n" " F f;\n" "}"); TODO_ASSERT_EQUALS("error", "", errout.str()); // side-effect variable functionVariableUsage( "class F {\n" "public:\n" " F() {\n" " int i = 0;\n" " (void) i;" " }\n" "};\n" "class G {\n" "public:\n" " F f;\n" "};\n" "void f() {\n" " G g;\n" "}"); ASSERT_EQUALS("", errout.str()); // side-effect variable in initialization list functionVariableUsage( "class F {\n" "public:\n" " F() {\n" " int i = 0;\n" " (void) i;" " }\n" "};\n" "class G {\n" "public:\n" " G() : f(F()) {}\n" " F f;" "};\n" "void f() {\n" " G g;\n" "}"); ASSERT_EQUALS("", errout.str()); // unknown variable type functionVariableUsage( "class H {\n" "public:\n" " unknown_type u{1};\n" "};\n" "void f() {\n" " H h;\n" "}"); ASSERT_EQUALS("", errout.str()); // unknown variable type in initialization list functionVariableUsage( "class H {\n" "public:\n" " H() : x{0}, u(1) {}\n" " int x;" " unknown_type u;\n" "};\n" "void f() {\n" " H h;\n" "}"); ASSERT_EQUALS("", errout.str()); // unknown variable type used for initialization functionVariableUsage( "unknown_type y = 0;\n" "class F {\n" "public:\n" " F() : x(y) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int sideEffectFunc();\n" "class F {\n" "public:\n" " F() : x(sideEffectFunc()) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "class F {\n" "public:\n" " F() : x(++unknownValue) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "class F {\n" "public:\n" " F() : x(--unknownValue) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "class F {\n" "public:\n" " F() : x(unknownValue+=1) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "class F {\n" "public:\n" " F() : x(unknownValue-=1) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("", errout.str()); } void cleanFunction() { // unknown function functionVariableUsage( "class F {\n" "public:\n" " F() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " F f;\n" "}"); ASSERT_EQUALS("", errout.str()); // function forward declaration functionVariableUsage( "int func();\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // return literal functionVariableUsage( "int func() { return 1; }\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:8]: (style) Unused variable: c\n", errout.str()); // return variable without side effects functionVariableUsage( "int func() {\n" " int x = 1;\n" " return x;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:11]: (style) Unused variable: c\n", errout.str()); // return variable with side effects functionVariableUsage( "int func() {\n" " unknown_type x = 1;\n" " return x;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // return unknown variable functionVariableUsage( "int func() {\n" " return unknown_var;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // return variable is global, but not changed functionVariableUsage( "int x = 1;\n" "int func() {\n" " return x;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:11]: (style) Unused variable: c\n", errout.str()); // changing global variable in return functionVariableUsage( "int x = 1;\n" "int func() {\n" " return x++;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // changing global variable in function body functionVariableUsage( "int x = 1;\n" "int func() {\n" " x++;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int x = 1;\n" "int func() {\n" " --x;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int x = 1;\n" "int func() {\n" " x += 2;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int x = 1;\n" "int func() {\n" " x = 2;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // global variable use in function body without change functionVariableUsage( "int global = 1;\n" "int func() {\n" " int x = global + 1;\n" " return x;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:12]: (style) Unused variable: c\n", errout.str()); // changing global array variable in function body functionVariableUsage( "int x[] = {0, 1, 3};\n" "int func() {\n" " x[0] = 4;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int x[] = {0, 1, 3};\n" "int func() {\n" " *x = 2;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int x[] = {0, 1, 3};\n" "int func() {\n" " *(x) = 2;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // pointer arithmetic on global array functionVariableUsage( "int x[] = {0, 1, 3};\n" "int func() {\n" " *(x + 1) = 2;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int x[][] = {{0, 1}, {2, 3}};\n" "int func() {\n" " *((x + 1) + 1) = 4;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int x[] = {0, 1, 3};\n" "int func() {\n" " int local = *(x + 1);\n" " (void) local;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:13]: (style) Unused variable: c\n", errout.str()); functionVariableUsage( "int x[] = {0, 1, 3};\n" "int func() {\n" " int* local = x + 2;\n" " (void) local;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:13]: (style) Unused variable: c\n", errout.str()); functionVariableUsage( "int x[] = {0, 1, 3};\n" "int func() {\n" " int* local = x + 2;\n" " return *local;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "int x[] = {0, 1, 3};\n" "int func() {\n" " return *(x + 1);\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // changing local variable functionVariableUsage( "int func() {\n" " int x = 1;\n" " x = 2;\n" " x++;\n" " return x;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:13]: (style) Unused variable: c\n", errout.str()); // variable of user-defined class without side effects functionVariableUsage( "class A {};\n" "A func() {\n" " A a;\n" " return a;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " A x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:12]: (style) Unused variable: c\n", errout.str()); // variable of user-defined class with side effects functionVariableUsage( "class A {\n" "public:\n" " unknown_type u{1};\n" "};\n" "int func() {\n" " A a;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // unknown type variable functionVariableUsage( "int func() {\n" " unknown_type a;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // nested clean function call functionVariableUsage( "int another_func() { return 1;}\n" "int func() {\n" " another_func();\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:12]: (style) Unused variable: c\n", errout.str()); // nested side-effects function call functionVariableUsage( "int global = 1;" "int another_func() {\n" " global++;\n" " return global;}\n" "int func() {\n" " another_func();\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // unknown nested function functionVariableUsage( "int func() {\n" " unknown_func();\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // clean function recursion functionVariableUsage( "int func(int i) {\n" " if (i != 2) {\n" " func(i++);\n" " return 2;\n" " }\n" " return i;\n" "}\n" "class C {\n" "public:\n" " C() : x(func(0)) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:14]: (style) Unused variable: c\n", errout.str()); // indirect clean function recursion functionVariableUsage( "void another_func() {\n" " func(0);\n" "}\n" "int func(int i) {\n" " if (i != 2) {\n" " another_func();\n" " return 2;\n" " }\n" " return i;\n" "}\n" "class C {\n" "public:\n" " C() : x(func(0)) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:17]: (style) Unused variable: c\n", errout.str()); // side-effect function recursion functionVariableUsage( "int global = 1;\n" "int func(int i) {\n" " if (i != 2) {\n" " global++;\n" " func(i++);\n" " return 2;\n" " }\n" " return i;\n" "}\n" "class C {\n" "public:\n" " C() : x(func(0)) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // multiple returns (side-effect & clean) functionVariableUsage( "int func(int i) {\n" " if (i == 0) { return 0;}\n" " else { return unknownSideEffectFunction(); }\n" "}\n" "class C {\n" "public:\n" " C() : x(func(0)) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // multiple clean returns functionVariableUsage( "int func(int i) {\n" " if (i == 0) { return 0;}\n" " else { return i; }\n" "}\n" "class C {\n" "public:\n" " C() : x(func(0)) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:11]: (style) Unused variable: c\n", errout.str()); // multiple side-effect returns functionVariableUsage( "int func(int i) {\n" " if (i == 0) { return unknownSideEffectFunction();}\n" " else { return unknown_var; }\n" "}\n" "class C {\n" "public:\n" " C() : x(func(0)) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // argument return functionVariableUsage( "int func(int i) {\n" " return i;\n" "}\n" "class C {\n" "public:\n" " C() : x(func(0)) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:10]: (style) Unused variable: c\n", errout.str()); // global variable modifying through function argument functionVariableUsage( "char buf[10];\n" "int func(char* p) {\n" " *p = 0;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func(buf)) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // global variable modifying through local pointer functionVariableUsage( "int global = 1;\n" "int func() {\n" " int* p = &global;\n" " *p = 0;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // global variable assigning to local pointer, but not modifying functionVariableUsage( "int global = 1;\n" "int func() {\n" " int* p = &global;\n" " (void) p;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:13]: (style) Unused variable: c\n", errout.str()); // global struct variable modification functionVariableUsage( "struct S { int x; } s;\n" "int func() {\n" " s.x = 1;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // global struct variable without modification functionVariableUsage( "struct S { int x; } s;\n" "int func() {\n" " int y = s.x + 1;\n" " return y;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:12]: (style) Unused variable: c\n", errout.str()); // global pointer to struct variable modification functionVariableUsage( "struct S { int x; };\n" "struct S* s = new(struct S);\n" "int func() {\n" " s->x = 1;\n" " return 1;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("", errout.str()); // global pointer to struct variable without modification functionVariableUsage( "struct S { int x; };\n" "struct S* s = new(struct S);\n" "int func() {\n" " int y = s->x + 1;\n" " return y;\n" "}\n" "class C {\n" "public:\n" " C() : x(func()) {}\n" " int x;\n" "};\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:13]: (style) Unused variable: c\n", errout.str()); } // #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 member 'abc::a' is never used.\n" "[test.cpp:4]: (style) struct member 'abc::b' is never used.\n" "[test.cpp:5]: (style) struct member 'abc::c' is never used.\n", errout.str()); checkStructMemberUsage("union abc\n" "{\n" " int a;\n" " int b;\n" " int c;\n" "};"); ASSERT_EQUALS("[test.cpp:3]: (style) union member 'abc::a' is never used.\n" "[test.cpp:4]: (style) union member 'abc::b' is never used.\n" "[test.cpp:5]: (style) 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("[test.cpp:4]: (style) struct member 'AB::b' is never used.\n", 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("[test.cpp:4]: (style) struct member 'AB::b' is never used.\n", 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 structmember12() { // #7179 checkStructMemberUsage("#include \n" "struct\n" "{\n" " union\n" " {\n" " struct\n" " {\n" " int a;\n" " } struct1;\n" " };\n" "} var = {0};\n" "int main(int argc, char *argv[])\n" "{\n" " printf(\"var.struct1.a = %d\", var.struct1.a);\n" " return 1;\n" "}"); ASSERT_EQUALS("", errout.str()); } void structmember13() { // #3088 - struct members required by hardware checkStructMemberUsage("struct S {\n" " int x;\n" "} __attribute__((packed));"); ASSERT_EQUALS("", errout.str()); } void structmember14() { // #6508 checkStructMemberUsage("struct bstr { char *bstart; size_t len; };\n" "struct bstr bstr0(void) {\n" " return (struct bstr){\"hello\",6};\n" "}"); ASSERT_EQUALS("", errout.str()); } void structmember15() { // #3088 std::list directives; directives.emplace_back("test.cpp", 1, "#pragma pack(1)"); checkStructMemberUsage("\nstruct Foo { int x; int y; };", &directives); 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" "}"); 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 member 'AB::a' is never used.\n", errout.str()); checkStructMemberUsage("struct A\n" "{\n" " static const int a = 0;\n" "};\n" "\n" "int foo()\n" "{\n" " return A::a;\n" "}"); ASSERT_EQUALS("", errout.str()); } void structmember_sizeof() { checkStructMemberUsage("struct Header {\n" " uint8_t message_type;\n" "}\n" "\n" "input.skip(sizeof(Header));"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct Header {\n" " uint8_t message_type;\n" "}\n" "\n" "input.skip(sizeof(struct Header));"); ASSERT_EQUALS("", errout.str()); } void structmember16() { checkStructMemberUsage("struct S {\n" " static const int N = 128;\n" // <- used " char E[N];\n" // <- not used "};\n"); ASSERT_EQUALS("[test.cpp:3]: (style) struct member 'S::E' is never used.\n", errout.str()); } void structmember17() { // #10591 checkStructMemberUsage("struct tagT { int i; };\n" "void f() {\n" " struct tagT t{};\n" " t.i = 0;\n" // <- used " g(t);\n" "};\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("typedef struct tagT { int i; } typeT;\n" "void f() {\n" " struct typeT t{};\n" " t.i = 0;\n" // <- used " g(t);\n" "};\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct T { int i; };\n" "void f() {\n" " struct T t{};\n" " t.i = 0;\n" // <- used " g(t);\n" "};\n"); TODO_ASSERT_EQUALS("", "[test.cpp:1]: (style) struct member 'T::i' is never used.\n", errout.str()); // due to removeMacroInClassDef() } void structmember18() { // #10684 checkStructMemberUsage("struct S { uint8_t padding[500]; };\n" "static S s = { 0 };\n" "uint8_t f() {\n" " uint8_t* p = (uint8_t*)&s;\n" " return p[10];\n" "};\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct S { uint8_t padding[500]; };\n" "uint8_t f(const S& s) {\n" " std::cout << &s;\n" " auto p = reinterpret_cast(&s);\n" " return p[10];\n" "};\n"); ASSERT_EQUALS("", errout.str()); } void structmember19() { checkStructMemberUsage("class C {};\n" // #10826 "struct S {\n" " char* p;\n" " std::string str;\n" " C c;\n" "};\n" "void f(S* s) {}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) struct member 'S::p' is never used.\n" "[test.cpp:4]: (style) struct member 'S::str' is never used.\n" "[test.cpp:5]: (style) struct member 'S::c' is never used.\n", errout.str()); checkStructMemberUsage("class C {};\n" "struct S {\n" " char* p;\n" " std::string str;\n" " C c;\n" "};\n" "void f(S& s) {}\n"); ASSERT_EQUALS("[test.cpp:3]: (style) struct member 'S::p' is never used.\n" "[test.cpp:4]: (style) struct member 'S::str' is never used.\n" "[test.cpp:5]: (style) struct member 'S::c' is never used.\n", errout.str()); checkStructMemberUsage("struct S {\n" // #10848 " struct T {\n" " int i;\n" " } t[2];\n" "};\n" "S s[1];\n" "int f() {\n" " return s[0].t[1].i;\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct S { int a; };\n" "struct T { S s; };\n" "int f(const T** tp) {\n" " return tp[0]->s.a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct S { int a; };\n" "int f(const S* sp) {\n" " return (*sp).a; \n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct S { int a; };\n" "int f(const S** spp) {\n" " return spp[0]->a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct S { int a; };\n" "int f(const S** spp) {\n" " return spp[0][0].a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct S { int a; };\n" "int f(const S* sp) {\n" " return sp[0].a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("struct S { int a; };\n" "int f(const S* sp) {\n" " return sp->a;\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("typedef struct { int i; } A;\n" "typedef struct { std::vector v; } B;\n" "const A& f(const std::vector& b, int idx) {\n" " const A& a = b[0]->v[idx];\n" " return a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:1]: (style) struct member 'A::i' is never used.\n", errout.str()); settings.enforcedLang = Settings::C; checkStructMemberUsage("struct A {\n" // #10852 " struct B {\n" " int x;\n" " } b;\n" "} a;\n" "void f() {\n" " struct B* pb = &a.b;\n" " pb->x = 1;\n" "}\n"); ASSERT_EQUALS("", errout.str()); checkStructMemberUsage("union U {\n" " struct A {\n" " struct B {\n" " int x;\n" " } b;\n" " } a;\n" " struct C {\n" " short s[2];\n" " } c;\n" "} u;\n" "void f() {\n" " struct B* pb = &u.a.b;\n" " pb->x = 1;\n" " struct C* pc = &u.c;\n" " pc->s[0] = 1;\n" "}\n"); ASSERT_EQUALS("", errout.str()); settings.enforcedLang = Settings::None; } void structmember20() { // #10737 checkStructMemberUsage("void f() {\n" " {\n" " }\n" " {\n" " struct S { int a; };\n" " S s{};\n" " {\n" " if (s.a) {}\n" " }\n" " }\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void functionVariableUsage_(const char* file, int line, const char code[], const char filename[] = "test.cpp") { // Clear the error buffer.. errout.str(""); // Tokenize.. Tokenizer tokenizer(&settings, this); std::istringstream istr(code); ASSERT_LOC(tokenizer.tokenize(istr, filename), file, line); // Check for unused variables.. CheckUnusedVar checkUnusedVar(&tokenizer, &settings, this); checkUnusedVar.checkFunctionVariableUsage(); } void localvar1() { // extracttests.disable 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("[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" " 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 = Data;\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 = Data;\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 = Data;\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 = Data;\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 = Data;\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 = DATA;\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 = DATA;\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 = X;\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()); // extracttests.start: int f(); 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" "}"); TODO_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:7]: (style) Variable 'i' is assigned a value that is never used.\n" "[test.cpp:3]: (style) Unused variable: i\n" "[test.cpp:5]: (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" " i = 1;\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" // redundant assignment "}"); ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'a' is assigned a value that is never used.\n" "[test.cpp:9]: (style) Variable 'x' is assigned a value that is never used.\n", 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("[test.cpp:10]: (style) Variable 'x' is assigned a value that is never used.\n", 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 = 15;\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 // extracttests.start: struct OBJECT { int ySize; }; 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("void foo()\n" "{\n" " char buf[5];\n" " char *ptr = buf;\n" " *(ptr++) = 0;\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'buf' is assigned a value that is never used.\n", "", errout.str()); // #3910 functionVariableUsage("void foo() {\n" " char buf[5];\n" " char *data[2];\n" " data[0] = buf;\n" " do_something(data);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void 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 // extracttests.disable // Don't crash when checking the code below! functionVariableUsage("void foo()\n" "{\n" " struct DATA *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()); // extracttests.enable } 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:4]: (style) Variable 'c' is assigned a value that is never used.\n" "[test.cpp:2]: (style) Variable 'a' is not assigned a value.\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[c]' 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("[test.cpp:3]: (style) Variable 'param' is assigned a value that is never used.\n", 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(int x) {\n" " C c;\n" // possibly some stream class " if (c >>= x) {}\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (information) --check-library: Provide configuration for C\n", errout.str()); functionVariableUsage("void f(int x) {\n" " C c;\n" " if (c >>= x) {}\n" "}", "test.c"); ASSERT_EQUALS("[test.c:3]: (style) Variable 'c' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void f() {\n" " int x, y;\n" " std::cin >> x >> y;\n" "}"); ASSERT_EQUALS("", errout.str()); // ticket #8494 functionVariableUsage("void f(C c) {\n" " int x;\n" " c & x;\n" "}"); ASSERT_EQUALS("", 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()); functionVariableUsage("int foo() {\n" // ticket #6147 " int a = 0;\n" " bar(a=a+2);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo() {\n" // ticket #6147 " int a = 0;\n" " bar(a=2);\n" "}"); TODO_ASSERT_EQUALS("error", "", errout.str()); functionVariableUsage("void bar(int);\n" "int foo() {\n" " int a = 0;\n" " bar(a=a+2);\n" "}"); TODO_ASSERT_EQUALS("error", "", 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() { // #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 localvar42() { // #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 localvar43() { // 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 localvar44() { // #4020 - FP functionVariableUsage("void func() {\n" " int *sp_mem[2] = { global1, global2 };\n" " sp_mem[0][3] = 123;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar45() { // #4899 - FP functionVariableUsage("int func() {\n" " int a = 123;\n" " int b = (short)-a;;\n" " return b;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar46() { // #5491/#5494/#6301 functionVariableUsage("int func() {\n" " int i = 0;\n" " int j{i};\n" " return j;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f(bool b, bool c, double& r) {\n" " double d{};\n" " if (b) {\n" " d = g();\n" " r += d;\n" " }\n" " if (c) {\n" " d = h();\n" " r += d;\n" " }\n" "}\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()); functionVariableUsage("int func() {\n" " std::shared_lock lock( m );\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" // #10490 " std::shared_lock lock = GetLock();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " auto&& g = std::lock_guard { mutex };\n" "}\n"); TODO_ASSERT_EQUALS("", "[test.cpp:2]: (style) Variable 'g' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void f() {\n" " auto a = RAII();\n" " auto b { RAII() };\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar47() { // #6603 // extracttests.disable functionVariableUsage("void f() {\n" " int (SfxUndoManager::*retrieveCount)(bool) const\n" " = (flag) ? &SfxUndoManager::foo : &SfxUndoManager::bar;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'retrieveCount' is assigned a value that is never used.\n", errout.str()); // extracttests.enable } void localvar48() { // #6954 functionVariableUsage("void foo() {\n" " long (*pKoeff)[256] = new long[9][256];\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar49() { // #7594 functionVariableUsage("class A {\n" " public:\n" " typedef enum { ID1,ID2,ID3 } Id_t;\n" " typedef struct {Id_t id; std::string a; } x_t;\n" " std::vector m_vec;\n" " std::vector Get(void);\n" " void DoSomething();\n" "};\n" "std::vector A::Get(void) {\n" " return m_vec;\n" "}\n" "const std::string Bar() {\n" " return \"x\";\n" "}\n" "void A::DoSomething(void) {\n" " const std::string x = Bar();\n" // <- warning "}"); ASSERT_EQUALS("[test.cpp:16]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); } void localvar50() { // #6261, #6542 // #6261 - ternary operator in function call functionVariableUsage("void foo() {\n" " char buf1[10];\n" " dostuff(cond?buf1:buf2);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo() {\n" " char buf1[10];\n" " dostuff(cond?buf2:buf1);\n" "}"); ASSERT_EQUALS("", errout.str()); // #6542 - ternary operator functionVariableUsage("void foo(int c) {\n" " char buf1[10], buf2[10];\n" " char *p = c ? buf1 : buf2;\n" " dostuff(p);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar51() { // #8128 FN // extracttests.start: struct Token { const Token* next() const; }; const Token* nameToken(); functionVariableUsage("void foo(const Token *var) {\n" " const Token *tok = nameToken();\n" " tok = tok->next();\n" // read+write "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'tok' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void foo() {\n" " int x = 4;\n" " x = 15 + x;\n" // read+write "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); } void localvar52() { functionVariableUsage("void foo() {\n" " std::vector data;\n" " data[2] = 32;\n" " return data;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar53() { functionVariableUsage("void foo(int a, int loop) {\n" " bool x = false;\n" " while (loop) {\n" " if (a) {\n" " x = true;\n" // unused value " continue;\n" " }\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void foo(int a, int loop) {\n" " bool x = false;\n" " while (loop) {\n" " if (a) {\n" " x = true;\n" " continue;\n" " }\n" " }\n" " return x;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar54() { functionVariableUsage("Padding fun() {\n" " Distance d = DISTANCE;\n" " return (Padding){ d, d, d, d };\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar55() { functionVariableUsage("void f(int mode) {\n" " int x = 0;\n" // <- redundant assignment "\n" " for (int i = 0; i < 10; i++) {\n" " if (mode == 0x04)\n" " x = 0;\n" // <- redundant assignment " if (mode == 0x0f) {\n" " x = address;\n" " data[x] = 0;\n" " }\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' is assigned a value that is never used.\n" "[test.cpp:6]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); } void localvar56() { functionVariableUsage("void f()\n" "{\n" " int x = 31;\n" " mask[x] |= 123;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar57() { functionVariableUsage("void f()\n" "{\n" " int x = 0;\n" " x++;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); } void localvar58() { // #9901 - increment false positive functionVariableUsage("void f() {\n" " int x = 0;\n" " if (--x > 0) {}\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " int x = 0;\n" " if (x-- > 0) {}\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); } void localvar59() { // #9737 functionVariableUsage("Response foo() {\n" " const std::vector cmanifest = z;\n" " return {.a = cmanifest, .b =0};\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar60() { // #10531 functionVariableUsage("void Scale(double scale) {\n" " for (int i = 0; i < m_points.size(); ++i) {\n" " auto& p = m_points[i];\n" " p += scale;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvar61() { // #9407 functionVariableUsage("void g(int& i);\n" "void f() {\n" " int var = 0;\n" " g(var);\n" " var = 2;\n" "}\n"); ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'var' is assigned a value that is never used.\n", errout.str()); } void localvar62() { functionVariableUsage("void f() {\n" // #10824 " S* s = nullptr;\n" "}\n"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 's' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void f() {\n" " S* s{};\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Variable 's' is assigned a value that is never used.\n", "", errout.str()); functionVariableUsage("int f() {\n" " int i = 0, j = 1;\n" " return i;\n" "}\n"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'j' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("int f() {\n" " int i = 0, j = 1;\n" " return j;\n" "}\n"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'i' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void f() {\n" // #10846 " int i = 1; while (i) { i = g(); }\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvar63() { // #6928 functionVariableUsage("void f(void) {\n" " int x=3;\n" // <- set but not used " goto y;\n" " y:return;\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); } void localvar64() { // #9997 functionVariableUsage("class S {\n" " ~S();\n" " S* f();\n" " S* g(int);\n" "};\n" "void h(S* s, bool b) {\n" " S* p = nullptr;\n" " S* q = nullptr;\n" " if (b) {\n" " p = s;\n" " q = s->f()->g(-2);\n" " }\n" " else\n" " q = s;\n" "}\n"); ASSERT_EQUALS("[test.cpp:10]: (style) Variable 'p' is assigned a value that is never used.\n" "[test.cpp:11]: (style) Variable 'q' is assigned a value that is never used.\n" "[test.cpp:14]: (style) Variable 'q' is assigned a value that is never used.\n", errout.str()); } void localvarloops() { // loops functionVariableUsage("void fun(int c) {\n" " int x;\n" " while (c) { x=10; }\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void dostuff(int x);\n" "void fun(int y, int c) {\n" " int x = 1;\n" " while (c) {\n" " dostuff(x);\n" " if (y) { x=10; break; }\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void dostuff(int &x);\n" "void fun() {\n" " int x = 1;\n" " while (c) {\n" " dostuff(x);\n" " if (y) { x=10; break; }\n" " }\n" "}"); ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'x' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void fun() {\n" " int x = 0;\n" " while (c) {\n" " dostuff(x);\n" " x = 10;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void fun() {\n" " int x = 0;\n" " while (x < 10) { x = x + 1; }\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void fun()\n" "{\n" " int status = 0;\n" " for (ind = 0; ((ind < nrArgs) && (status < 10)); ind++)\n" " status = x;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f()\n" "{\n" " int sum = 0U;\n" " for (i = 0U; i < 2U; i++)\n" " sum += 123;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'sum' is assigned a value that is never used.\n" "[test.cpp:5]: (style) Variable 'sum' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void f(int c) {\n" // #7908 " int b = 0;\n" " while (g()) {\n" " int a = c;\n" " b = a;\n" " if (a == 4)\n" " a = 5;\n" " }\n" " h(b);\n" "}\n"); ASSERT_EQUALS("[test.cpp:7]: (style) Variable 'a' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void f(const std::vector& v) {\n" " while (g()) {\n" " const std::vector& v2 = h();\n" " if (std::vector{ 1, 2, 3 }.size() > v2.size()) {}\n" " }\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f(const std::vector& v) {\n" " while (g()) {\n" " const std::vector& v2 = h();\n" " if (std::vector({ 1, 2, 3 }).size() > v2.size()) {}\n" " }\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f(const std::string &c) {\n" " std::string s = str();\n" " if (s[0] == '>')\n" " s[0] = '<';\n" " if (s == c) {}\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f(bool b) {\n" " std::map> m;\n" " if (b) {\n" " const std::string n = g();\n" " std::vector c = h();\n" " m[n] = c;\n" " }\n" " j(m);\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("struct S { int i; };\n" "S f(S s, bool b) {\n" " if (b)\n" " s.i = 1;\n" " return s;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvaralias1() { functionVariableUsage("void foo()\n" "{\n" " int a;\n" " int *b = &a;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used.\n" "[test.cpp:3]: (style) Unused variable: a\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a[10];\n" " int *b = a;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'b' is assigned a value that is never used.\n" "[test.cpp:3]: (style) Unused variable: a\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " int a;\n" " int *b = &a;\n" " *b = 0;\n" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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()); // extracttests.start: int a[10]; functionVariableUsage("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" "}"); TODO_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:5]: (style) Variable 'c' is assigned a value that is never used.\n" "[test.cpp:3]: (style) Unused variable: a\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" "", 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" "}"); TODO_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] = 1;\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'b[-10]' 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(// TODO "[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" " c[1] = 3;\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'c[1]' 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" "}"); TODO_ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'c[1]' is assigned a value that is never used.\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:5]: (style) Variable 's' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Unused variable: a\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:5]: (style) Variable 's' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Unused variable: a\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:5]: (style) Variable 's' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Unused variable: a\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:5]: (style) Variable 's' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Unused variable: a\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", 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" "}"); TODO_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:5]: (style) Variable 'a' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Variable 'ab' is not assigned a value.\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 // extracttests.start: int a(); void b(const char *); 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" "}"); TODO_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" "}"); TODO_ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'buf' is assigned a value that is never used.\n", "", errout.str()); functionVariableUsage("void foo(char *vdata)\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" "}"); TODO_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" "}"); TODO_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"); TODO_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 localvaralias14() { // #5619 functionVariableUsage("char * dostuff(char *p);\n" "void f() {\n" " char a[4], *p=a;\n" " p = dostuff(p);\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'p' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("char * dostuff(char *&p);\n" "void f() {\n" " char a[4], *p=a;\n" " p = dostuff(p);\n" "}"); ASSERT_EQUALS("", errout.str()); // TODO: we can warn in this special case; variable is local and there are no function calls after the assignment functionVariableUsage("void f() {\n" " char a[4], *p=a;\n" " p = dostuff(p);\n" "}"); ASSERT_EQUALS("", errout.str()); // TODO: we can warn in this special case; variable is local and there are no function calls after the assignment } void localvaralias15() { // #6315 functionVariableUsage("void f() {\n" " int x=3;\n" " int *p = &x;\n" " int *p2[1] = {p};\n" " dostuff(p2);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvaralias16() { functionVariableUsage("void f() {\n" " auto x = dostuff();\n" " p = x;\n" " x->data[0] = 9;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvaralias17() { functionVariableUsage("void f() {\n" " int x;\n" " unknown_type p = &x;\n" " *p = 9;\n" "}", "test.c"); ASSERT_EQUALS("", errout.str()); } void localvaralias18() { functionVariableUsage("void add( std::vector< std::pair< int, double > >& v)\n" "{\n" " std::vector< std::pair< int, double > >::iterator it;\n" " for ( it = v.begin(); it != v.end(); ++it )\n" " {\n" " if ( x )\n" " {\n" " ( *it ).second = 0;\n" " break;\n" " }\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvaralias19() { // #9828 functionVariableUsage("void f() {\n" " bool b0{}, b1{};\n" " struct {\n" " bool* pb;\n" " int val;\n" " } Map[] = { {&b0, 0}, {&b1, 1} };\n" " b0 = true;\n" " for (auto & m : Map)\n" " if (m.pb && *m.pb)\n" " m.val = 1;\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvaralias20() { // #10966 functionVariableUsage("struct A {};\n" "A g();\n" "void f() {\n" " const auto& a = g();\n" " const auto& b = a;\n" " const auto&& c = g();\n" " auto&& d = c;\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'b' is assigned a value that is never used.\n" "[test.cpp:7]: (style) Variable 'd' is assigned a value that is never used.\n", "[test.cpp:7]: (style) Variable 'd' is assigned a value that is never used.\n", 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() { // extracttests.disable 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()); // extracttests.enable functionVariableUsage("struct 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("[test.cpp:4]: (style) Variable 'a.i' is assigned a value that is never used.\n", 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()); // extracttests.disable 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()); // extracttests.enable 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 localvarStruct7() { functionVariableUsage("struct IMAPARG {\n" " void *text;\n" "};\n" "\n" "void fun() {\n" " IMAPARG *args, aatt;\n" " args = &aatt;\n" " aatt.text = tmp;\n" " dostuff(args);\n" "}"); ASSERT_EQUALS("", errout.str()); // extracttests.start: void dostuff(int*); functionVariableUsage("struct ARG {\n" " int a;\n" " int b;\n" "};\n" "\n" "void fun() {\n" " ARG aatt;\n" " int *p = &aatt.b;\n" " aatt.a = 123;\n" " dostuff(p);\n" "}"); ASSERT_EQUALS("[test.cpp:9]: (style) Variable 'aatt.a' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("struct AB {\n" " int a;\n" " int b;\n" "};\n" "\n" "void fun() {\n" " AB ab;\n" " int &a = ab.a;\n" " ab.a = 123;\n" " dostuff(a);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarStruct8() { functionVariableUsage("struct s {\n" " union {\n" " struct {\n" " int fld1 : 16;\n" " int fld2 : 16;\n" " };\n" " int raw;\n" " };\n" "};\n" "\n" "void foo() {\n" " struct s test;\n" " test.raw = 0x100;\n" " dostuff(test.fld1, test.fld2);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarStruct9() { functionVariableUsage("struct XY { int x; int y; };\n" "\n" "void foo() {\n" " struct XY xy(get());\n" " return xy.x + xy.y;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarStruct10() { // #6766 functionVariableUsage("struct S { int x; };\n" "\n" "void foo(const struct S s2) {\n" " struct S s;\n" " s.x = 3;\n" " memcpy (&s, &s2, sizeof (S));\n" "}"); ASSERT_EQUALS("[test.cpp:5]: (style) Variable 's.x' is assigned a value that is never used.\n", errout.str()); } void localvarStruct11() { // #10095 functionVariableUsage("struct Point { int x; int y; };\n" "Point scale(Point *p);\n" "\n" "int foo() {\n" " Point p;\n" " p.x = 42;\n" " return scale(&p).y;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarStruct12() { // #10495 functionVariableUsage("struct S { bool& Ref(); };\n" "\n" "void Set() {\n" " S s;\n" " s.Ref() = true;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarStruct13() { // #10398 functionVariableUsage("int f() {\n" " std::vector Mode;\n" " Info Block = {\n" " {\n" " { &Mode },\n" " { &Level }\n" " }\n" " };\n" " Mode.resize(N);\n" " for (int i = 0; i < N; ++i)\n" " Mode[i] = \"abc\";\n" " return Save(&Block);\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvarStructArray() { // extracttests.start: struct X {int a;}; // #3633 - detect that struct array is assigned a value functionVariableUsage("void f() {\n" " struct X x[10];\n" " x[0].a = 5;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x[0].a' is assigned a value that is never used.\n", errout.str()); } void localvarUnion1() { // #9707 functionVariableUsage("static short read(FILE *fp) {\n" " typedef union { short s; unsigned char c[2]; } u;\n" " u x;\n" " x.c[0] = fgetuc(fp);\n" " x.c[1] = fgetuc(fp);\n" " return x.s;\n" "}"); ASSERT_EQUALS("", 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 localvarDeclaredInIf() { functionVariableUsage("int foo(int x)\n" "{\n" " if (int y = x % 2)\n" " return 2;\n" " else\n" " return 1;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'y' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("int foo(int x)\n" "{\n" " if (int y = x % 2)\n" " return y;\n" " else\n" " return 1;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo(int x)\n" "{\n" " if (int y = x % 2)\n" " return 2;\n" " else\n" " return y;\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:3]: (style) Variable 'a' is assigned a value that is never used.\n" "[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()); functionVariableUsage("void foo() {\n" " int a=1, b[10];\n" " b[0] = x;\n" " a += b[0];\n" " return a;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f(int *start, int *stop) {\n" " int length = *start - *stop;\n" " if (length < 10000)\n" " length = 10000;\n" " *stop -= length;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f(int a) {\n" " int x = 3;\n" " a &= ~x;\n" " return a;\n" "}"); ASSERT_EQUALS("", errout.str()); // extracttests.disable functionVariableUsage("void f() {\n" // unknown class => library configuration is needed " Fred fred;\n" " int *a; a = b;\n" " fred += a;\n" "}"); ASSERT_EQUALS("[test.cpp:4]: (information) --check-library: Provide configuration for Fred\n", errout.str()); // extracttests.enable functionVariableUsage("void f(std::pair x) {\n" " std::pair fred;\n" // class with library configuration " fred = x;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'fred' 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" "}"); 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()); // #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 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" " static const int ci;\n" " static std::string s;\n" " static const std::string cs;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n" "[test.cpp:4]: (style) Unused variable: ci\n" "[test.cpp:5]: (style) Unused variable: s\n" "[test.cpp:6]: (style) Unused variable: cs\n", errout.str()); functionVariableUsage("void foo()\n" "{\n" " static int i = 0;\n" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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" "}"); TODO_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()); functionVariableUsage("void foo() {\n" " static int x = 0;\n" " print(x);\n" " if(x > 5)\n" " x = 0;\n" " else\n" " x++;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo(int value) {\n" " static int array[16] = {0};\n" " if(array[value]) {}\n" " array[value] = 1;\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" " 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()); // extracttests.disable 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()); // extracttests.enable 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("[test.cpp:4]: (style) Variable 'fred' is allocated memory that is never used.\n", 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 = (Fred*)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 = (Fred*)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 = (Fred*)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 = (Fred*)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()); // extracttests.disable 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()); // extracttests.enable 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" " 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" " 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 = (Fred*)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 = (Fred*)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 #3467 - 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" "}"); TODO_ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'p' is modified but its new value is never used.\n", "", 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 localvararray4() { functionVariableUsage("void foo() {\n" " int p[1];\n" " int *pp[0];\n" " p[0] = 1;\n" " *pp[0] = p[0];\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvararray5() { functionVariableUsage("int foo() {\n" " int p[5][5];\n" " dostuff(*p);\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("void foo() {\n" // #8901 " const 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()); functionVariableUsage("void f() {\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("void f() {\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()); } 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 localvarreturn() { // ticket #9167 functionVariableUsage("void foo() {\n" " const int MyInt = 1;\n" " class bar {\n" " public:\n" " bool operator()(const int &uIndexA, const int &uIndexB) const {\n" " return true;\n" " }\n" " bar() {}\n" " };\n" " return MyInt;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarmaybeunused() { functionVariableUsage("int main() {\n" " [[maybe_unused]] int x;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("[[nodiscard]] int getX() { return 4; }\n" "int main() {\n" " [[maybe_unused]] int x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("[[nodiscard]] int getX() { return 4; }\n" "int main() {\n" " [[maybe_unused]] int x = getX();\n" " x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("[[nodiscard]] int getX() { return 4; }\n" "int main() {\n" " [[maybe_unused]] int x = getX();\n" " x = getX();\n" " std::cout << x;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] const int x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] const int& x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] const int* x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] int& x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] int* x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] auto x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] auto&& x = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] int x[] = getX();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] constexpr volatile static int x = 1;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("[[maybe_unused]] inline int x = 1;"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " [[maybe_unused]] [[anotherattribute]] const int* = 1;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarthrow() { // ticket #3687 functionVariableUsage("void foo() {\n" " try {}" " catch(Foo& bar) {}\n" "}"); ASSERT_EQUALS("", errout.str()); } void localVarStd() { // extracttests.start: struct MyClass {int x;}; std::string foo(); 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" "}"); 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::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()); functionVariableUsage("void f() {\n" // #7732 " const std::pair p(\"a\", \"b\");\n" " std::pair q{\"a\", \"b\" };\n" " auto r = std::pair(\"a\", \"b\");\n" " auto s = std::pair{ \"a\", \"b\" };\n" "}\n"); TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'p' is assigned a value that is never used.\n" "[test.cpp:3]: (style) Variable 'q' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Variable 'r' is assigned a value that is never used.\n" "[test.cpp:5]: (style) Variable 's' is assigned a value that is never used.\n", "[test.cpp:2]: (style) Variable 'p' is assigned a value that is never used.\n" "[test.cpp:3]: (style) Variable 'q' is assigned a value that is never used.\n", errout.str()); } void localVarClass() { functionVariableUsage("void f() {\n" " Fred f;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class C { int x; };\n" "void f() {\n" " C c;\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: c\n", errout.str()); functionVariableUsage("class ExampleClass\n" // #10000 "{\n" "public:\n" " ExampleClass(int xScale, int yScale, int x, int y)\n" " : XScale(xScale)\n" " , YScale(yScale)\n" " , X(x)\n" " , Y(y)\n" " {\n" " }\n" " \n" " int XScale;\n" " int YScale;\n" " int X;\n" " int Y;\n" "};\n" " \n" "void foo()\n" "{\n" " ExampleClass ex(1, 2, 3, 4);\n" "}"); ASSERT_EQUALS("[test.cpp:20]: (style) Variable 'ex' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("class C { public: C(int); ~C(); };\n" "void f() {\n" " C c(12);\n" "}"); ASSERT_EQUALS("", errout.str()); } void localVarSmartPtr() { // handling of smart pointers (#9680) functionVariableUsage("static int s_i = 0;\n" "\n" "class A {\n" "public:\n" " ~A() {\n" " ++s_i;\n" " }\n" "};\n" "\n" "static void func() {\n" " auto a = std::make_shared ();\n" " auto a2 = std::unique_ptr (new A());\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("class A {\n" "public:\n" " std::string x;\n" "};\n" "\n" "static void func() {\n" " auto a = std::make_shared ();\n" " auto a2 = std::unique_ptr (new A());\n" "}\n"); ASSERT_EQUALS("[test.cpp:7]: (style) Variable 'a' is assigned a value that is never used.\n" "[test.cpp:8]: (style) Variable 'a2' is assigned a value that is never used.\n", errout.str()); functionVariableUsage("void g();\n" // #11094 "void f() {\n" " auto p = std::make_unique();\n" " p = nullptr;\n" " g();\n" "}\n"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int f(int *p) {\n" // #10703 " std::unique_ptr up(p);\n" " return *p;\n" "}\n" "int g(int* p) {\n" " auto up = std::unique_ptr(p);\n" " return *p;\n" "}\n"); 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" "}"); ASSERT_EQUALS("", errout.str()); // Don't write an error that "a" is not used functionVariableUsage("void x() {\n" " unsigned char* pcOctet = NULL;\n" " float fValeur;\n" " switch (pnodeCurrent->left.pnode->usLen) {\n" " case 4:\n" " fValeur = (float)pevalDataLeft->data.fd;\n" " pcOctet = (unsigned char*)&fValeur;\n" " break;\n" " case 8:\n" " pcOctet = (unsigned char*)&pevalDataLeft->data.fd;\n" " break;\n" " }\n" " for (iIndice = 1; iIndice <= (pnodeCurrent->usLen / 2); iIndice++) {\n" " *pcData = gacHexChar[(*pcOctet >> 4) & 0x0F];\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); // Don't write an error that "fValeur" is not used } 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()); functionVariableUsage("void f(Foo *p) {\n" " free(p);\n" " p = (Foo *)NULL;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" // #11079 " std::string s1{ nullptr };\n" " std::string s2{ NULL };\n" " std::string s4(nullptr);\n" " std::string s5(NULL);\n" "}\n" "struct A { A(void*) {} };\n" "static void g() {\n" " A a1{ nullptr };\n" " A a2{ NULL };\n" " A a4(nullptr);\n" " A a5(NULL);\n" "}\n"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 's1' is assigned a value that is never used.\n" "[test.cpp:3]: (style) Variable 's2' is assigned a value that is never used.\n" "[test.cpp:4]: (style) Variable 's4' is assigned a value that is never used.\n" "[test.cpp:5]: (style) Variable 's5' is assigned a value that is never used.\n" "[test.cpp:9]: (style) Variable 'a1' is assigned a value that is never used.\n" "[test.cpp:10]: (style) Variable 'a2' is assigned a value that is never used.\n" "[test.cpp:11]: (style) Variable 'a4' is assigned a value that is never used.\n" "[test.cpp:12]: (style) Variable 'a5' is assigned a value that is never used.\n", 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" "}"); ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'X' is assigned a value that is never used.\n", 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 localvarLambda() { functionVariableUsage("int foo() {\n" " auto f = []{return 1};\n" " return f();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo() {\n" " auto f = []{return 1};\n" " auto g = []{return 1};\n" " return f() + g();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void foo(std::vector& v) {\n" " int n = 0;\n" " std::generate(v.begin(), v.end(), [&n] {\n" " int r = n;\n" " n += 2;\n" " return r;\n" " });\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarStructuredBinding() { functionVariableUsage("void f() {\n" // #10368 " std::map m;\n" " m[2] = 2.0;\n" " for (auto& [k, v] : m) {}\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvarCppInitialization() { functionVariableUsage("void foo() {\n" " int buf[6];\n" " Data data(buf);\n" "}"); ASSERT_EQUALS("[test.cpp:3]: (information) --check-library: Provide configuration for Data\n", 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 localvarRangeBasedFor() { // #7075 functionVariableUsage("void reset() {\n" " for (auto & e : array)\n" " e = 0;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarAssignInWhile() { functionVariableUsage("void foo() {\n" " int a = 0;\n" " do {\n" " dostuff(a);\n" " } while((a + = x) < 30);\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int foo() {\n" " int var = 1;\n" " while (var = var >> 1) { }\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarTemplate() { functionVariableUsage("template void f() {}\n" "void foo() {\n" " const int x = 0;\n" " f();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " constexpr std::size_t ArraySize(5);\n" " std::array X; X.dostuff();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" // #10686 " std::array a;\n" "}\n"); ASSERT_EQUALS("[test.cpp:2]: (style) Unused variable: a\n", errout.str()); functionVariableUsage("class A {};\n" // #9471 " namespace std {\n" " template<>\n" " struct hash {};\n" "}\n" "char f() {\n" " std::string hash = \"-\";\n" " return hash[0];\n" "}\n"); ASSERT_EQUALS("", errout.str()); } void localvarFuncPtr() { functionVariableUsage("int main() {\n" " void(*funcPtr)(void)(x);\n" "}"); TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'funcPtr' is assigned a value never used.\n", "", errout.str()); functionVariableUsage("int main() {\n" " void(*funcPtr)(void);\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Unused variable: funcPtr\n", errout.str()); functionVariableUsage("int main() {\n" " void(*funcPtr)(void)(x);\n" " funcPtr();\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("int main() {\n" " void(*funcPtr)(void) = x;\n" " funcPtr();\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarAddr() { // #7747 functionVariableUsage("void f() {\n" " int x = 0;\n" " dostuff(&x);\n" " x = 1;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage("void f() {\n" " int x = 0;\n" " dostuff(std::ref(x));\n" " x = 1;\n" "}"); ASSERT_EQUALS("", errout.str()); } void localvarDelete() { // #8339 functionVariableUsage("void reassign(char*& data, int size)" "{" " char* buf = new char[size];" "" " char* tmp = data;" " data = buf;" " buf = tmp;" "" " delete [] buf;" "}"); 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()); } void lambdaFunction() { // #7026 functionVariableUsage("void f() {\n" " bool first = true;\n" "\n" " auto do_something = [&first]() {\n" " if (first) {\n" " first = false;\n" " } else {\n" " dostuff();\n" " }\n" " };\n" " do_something();\n" " do_something();\n" "}"); ASSERT_EQUALS("", 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" "}"); TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x' is assigned a value that is never used.\n", "", errout.str()); } void namespaces() { // #7557 functionVariableUsage("namespace t { namespace g {\n" " typedef std::pair value;\n" "} }\n" "namespace t { namespace g {} }\n" "namespace t {\n" " inline double getTime() const {\n" " iterator it=find();\n" " double& value=it->second.values[index];\n" " if(isnan(value)) {\n" " value=get();\n" " }\n" " return value;\n" " }\n" "}"); ASSERT_EQUALS("", errout.str()); } void bracesInitCpp11() { functionVariableUsage( "int fun() {\n" " static int fpUnread{0};\n" " const int var{fpUnread++};\n" " return var;\n" "}"); ASSERT_EQUALS("", errout.str()); } void argument() { functionVariableUsage( "void fun(Value value) {\n" " value[10] = 123;\n" "}"); ASSERT_EQUALS("", errout.str()); functionVariableUsage( "void fun(std::string s) {\n" " s[10] = 123;\n" "}"); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 's[10]' is assigned a value that is never used.\n", errout.str()); functionVariableUsage( "void fun(short data[2]) {\n" " data[2] = 1;\n" "}" ); ASSERT_EQUALS("", errout.str()); // Unknown argument type functionVariableUsage( "void A::b(Date& result) {" " result = 12;\n" "}" ); ASSERT_EQUALS("", errout.str()); { // #8914 functionVariableUsage( // assume unknown argument type is reference "void fun(Date result) {" " result.x = 12;\n" "}" ); ASSERT_EQUALS("", errout.str()); functionVariableUsage( // there is no reference type in C "void fun(Date result) {" " result.x = 12;\n" "}", "test.c" ); ASSERT_EQUALS("[test.c:1]: (style) Variable 'result.x' is assigned a value that is never used.\n", errout.str()); functionVariableUsage( "struct Date { int x; };\n" "void fun(Date result) {" " result.x = 12;\n" "}" ); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'result.x' is assigned a value that is never used.\n", errout.str()); } // Unknown struct type functionVariableUsage( "void fun() {" " struct FOO foo;\n" " foo.x = 123;\n" "}" ); ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'foo.x' is assigned a value that is never used.\n", errout.str()); } void argumentClass() { functionVariableUsage( "void foo(std::insert_iterator it) {\n" " it = 123;\n" "}"); ASSERT_EQUALS("", errout.str()); } void escapeAlias() { functionVariableUsage( "struct A {\n" " std::map m;\n" " void f(int key, int number) {\n" " auto pos = m.find(key);\n" " if (pos == m.end())\n" " m.insert(std::map::value_type(key, number));\n" " else\n" " (*pos).second = number;\n" " }\n" "};"); ASSERT_EQUALS("", errout.str()); } void volatileData() { functionVariableUsage( "struct Data { unsigned int n; };\n" "int main() {\n" " (*(volatile struct Data*)0x4200).n = 1;\n" "}"); ASSERT_EQUALS("", errout.str()); } void globalData() { // #10276 functionVariableUsage( "void f(void) {\n" " ((uint8_t *) (uint16_t)0x1000)[0] = 0x42;\n" "}"); ASSERT_EQUALS("", errout.str()); } }; REGISTER_TEST(TestUnusedVar)