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cppcheck/test/testunusedvar.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2023 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 <http://www.gnu.org/licenses/>.
*/
#include "checkunusedvar.h"
#include "errortypes.h"
#include "preprocessor.h"
#include "settings.h"
#include "fixture.h"
#include "tokenize.h"
#include <list>
#include <sstream> // IWYU pragma: keep
#include <string>
class TestUnusedVar : public TestFixture {
public:
TestUnusedVar() : TestFixture("TestUnusedVar") {}
private:
Settings settings;
void run() override {
settings.severity.enable(Severity::style);
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(structmember21); // #4759
TEST_CASE(structmember22); // #11016
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(localvar65); // #9876, #10006
TEST_CASE(localvar66); // #11143
TEST_CASE(localvar67); // #9946
TEST_CASE(localvar68);
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<Directive>* directives = nullptr) {
// Clear the error buffer..
errout.str("");
Preprocessor preprocessor(settings, nullptr);
if (directives)
preprocessor.setDirectives(*directives);
// Tokenize..
Tokenizer tokenizer(&settings, this, &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 checkFunctionVariableUsageP(const char code[], const char* filename = "test.cpp") {
// Raw tokens..
std::vector<std::string> files(1, filename);
std::istringstream istr(code);
const simplecpp::TokenList tokens1(istr, files, files[0]);
// Preprocess..
simplecpp::TokenList tokens2(files);
std::map<std::string, simplecpp::TokenList*> filedata;
simplecpp::preprocess(tokens2, tokens1, files, filedata, simplecpp::DUI());
Preprocessor preprocessor(settings, nullptr);
preprocessor.setDirectives(tokens1);
// Tokenizer..
Tokenizer tokenizer(&settings, this, &preprocessor);
tokenizer.createTokens(std::move(tokens2));
tokenizer.simplifyTokens1("");
// Check for unused variables..
CheckUnusedVar checkUnusedVar(&tokenizer, &settings, this);
(checkUnusedVar.checkFunctionVariableUsage)();
}
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());
functionVariableUsage(
"struct S {\n"
" static void f() { std::cout << \"f()\"; }\n"
" ~S() { f(); }\n"
"};\n"
"void g() {\n"
" S s;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage( // #11109
"class D { public: D(); };\n"
"class E { public: ~E(); };\n"
"class F {\n"
"public:\n"
" F();\n"
" ~F();\n"
"};\n"
"void f() {\n"
" D d;\n"
" E e;\n"
" F f;\n"
"}\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 <stdio.h>\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<Directive> 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<const uint8_t*>(&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<A> v; } B;\n"
"const A& f(const std::vector<const B*>& 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 structmember21() { // #4759
checkStructMemberUsage("class C {\n"
"public:\n"
" int f() { return 0; }\n"
"};\n"
"C C;\n"
"int g() {\n"
" return c.f();\n"
"}\n"
"struct S {\n"
" int f;\n"
"};\n");
ASSERT_EQUALS("[test.cpp:10]: (style) struct member 'S::f' is never used.\n", errout.str());
checkStructMemberUsage("struct A { int i; };\n"
"struct B { struct A* pA; };");
ASSERT_EQUALS("[test.cpp:1]: (style) struct member 'A::i' is never used.\n"
"[test.cpp:2]: (style) struct member 'B::pA' is never used.\n",
errout.str());
}
void structmember22() { // #11016
checkStructMemberUsage("struct A { bool b; };\n"
"void f(const std::vector<A>& v) {\n"
" std::vector<A>::const_iterator it = b.begin();\n"
" if (it->b) {}\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<<code<<std::endl;\n"
" code += 2;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0,code=10,d=10;\n"
" for(i = 0; i < 10; i++) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" d = code;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (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());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0,code=10,d=10;\n"
" for(i = 0; i < 10; i++) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" g(d);\n"
" d = code;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0,code=10,d=10;\n"
" for(i = 0; i < 10; i++) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" if (i == 3) {\n"
" return d;\n"
" }\n"
" d = code;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0,a=10,b=20;\n"
" for(i = 0; i < 10; i++) {\n"
" std::cout<<a<<std::endl;\n"
" int tmp=a;\n"
" a=b;\n"
" b=tmp;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10;\n"
" while(code < 20) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10,d=10;\n"
" while(code < 20) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" d += code;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (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());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10,d=10;\n"
" while(code < 20) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" g(d);\n"
" d += code;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10,d=10;\n"
" while(code < 20) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" if (i == 3) {\n"
" return d;\n"
" }\n"
" d += code;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a=10,b=20;\n"
" while(a != 30) {\n"
" std::cout<<a<<std::endl;\n"
" int tmp=a;\n"
" a=b;\n"
" b=tmp;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10;\n"
" do {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" } while(code < 20);\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10,d=10;\n"
" do {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" d += code;\n"
" } while(code < 20);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (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());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10,d=10;\n"
" do {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" g(d);\n"
" d += code;\n"
" } while(code < 20);\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10,d=10;\n"
" do {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" if (i == 3) {\n"
" return d;\n"
" }\n"
" d += code;\n"
" } while(code < 20);\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int a=10,b=20;\n"
" do {\n"
" std::cout<<a<<std::endl;\n"
" int tmp=a;\n"
" a=b;\n"
" b=tmp;\n"
" } while( a!=30 );\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10;\n"
" for(int i=0; i < 10; i++) {\n"
" if(true) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10;\n"
" for(int i=0; i < 10; i++) {\n"
" if(true) {\n"
" std::cout<<code<<std::endl;\n"
" }\n"
" code += 2;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10;\n"
" while(code < 20) {\n"
" if(true) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int code=10;\n"
" do {\n"
" if(true) {\n"
" std::cout<<code<<std::endl;\n"
" code += 2;\n"
" }\n"
" } while(code < 20);\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo(int j = 0) {\n" // #5985 - default function parameters should not affect checking results
" int i = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'i' is assigned a value that is never used.\n", errout.str());
// extracttests.enable
}
void localvar2() {
// extracttests.disable: uninitialized variables and stuff
functionVariableUsage("int foo()\n"
"{\n"
" int i;\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value.\n", errout.str());
functionVariableUsage("bool foo()\n"
"{\n"
" bool i;\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value.\n", errout.str());
// undefined variables are not reported because they may be classes with constructors
functionVariableUsage("undefined foo()\n"
"{\n"
" undefined i;\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("undefined foo()\n"
"{\n"
" undefined i;\n"
" return i;\n"
"}\n",
"test.c");
ASSERT_EQUALS("[test.c:3]: (style) Variable 'i' is not assigned a value.\n", errout.str());
functionVariableUsage("undefined *foo()\n"
"{\n"
" undefined * i;\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value.\n", errout.str());
functionVariableUsage("int *foo()\n"
"{\n"
" int * i;\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value.\n", errout.str());
functionVariableUsage("const int *foo()\n"
"{\n"
" const int * i;\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value.\n", errout.str());
functionVariableUsage("struct S *foo()\n"
"{\n"
" struct S * i;\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value.\n", errout.str());
functionVariableUsage("const struct S *foo()\n"
"{\n"
" const struct S * i;\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' is not assigned a value.\n", errout.str());
// assume f() can write a
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0]);\n"
"}");
ASSERT_EQUALS("", errout.str());
// assume f() can write a
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0], 0);\n"
"}");
ASSERT_EQUALS("", errout.str());
// assume f() can write a
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" f(0, a[0]);\n"
"}");
ASSERT_EQUALS("", errout.str());
// assume f() can write a
functionVariableUsage("void foo()\n"
"{\n"
" int a[10];\n"
" f(0, a[0], 0);\n"
"}");
ASSERT_EQUALS("", errout.str());
// f() can not write a (not supported yet)
functionVariableUsage("void f(const int & i) { }\n"
"void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0]);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'a' is not assigned a value.\n",
"", errout.str());
// f() writes a
functionVariableUsage("void f(int & i) { }\n"
"void foo()\n"
"{\n"
" int a[10];\n"
" f(a[0]);\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void f(int * i);\n"
"void foo()\n"
"{\n"
" int a[10];\n"
" f(a+1);\n"
"}");
ASSERT_EQUALS("", errout.str());
// extracttests.enable
}
void localvar3() {
functionVariableUsage("void foo(int abc)\n"
"{\n"
" int i;\n"
" if ( abc )\n"
" ;\n"
" else i = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (style) Variable 'i' is assigned a value that is never used.\n", errout.str());
}
void localvar4() {
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0;\n"
" f(i);\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0;\n"
" f(&i);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void localvar5() {
functionVariableUsage("void foo()\n"
"{\n"
" int a = 0;\n"
" b = (char)a;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void localvar6() {
functionVariableUsage("void foo() {\n"
" int b[10];\n"
" for (int i=0;i<10;++i)\n"
" b[i] = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'b[i]' is assigned a value that is never used.\n", errout.str());
functionVariableUsage("void foo() {\n"
" int a = 0;\n"
" int b[10];\n"
" for (int i=0;i<10;++i)\n"
" b[i] = ++a;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'b[i]' is assigned a value that is never used.\n", errout.str());
functionVariableUsage("void foo() {\n"
" int b[10];\n"
" for (int i=0;i<10;++i)\n"
" *(b+i) = 0;\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (style) Variable '*(b+i)' is assigned a value that is never used.\n", "", errout.str());
}
void localvar8() {
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i[2];\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" void * i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const void * i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
// extracttests.start: struct A {int x;};
functionVariableUsage("void foo()\n"
"{\n"
" A * i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" struct A * i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const struct A * i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int * i[2];\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", "", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const int * i[2];\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", "", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" void * i[2];\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", "", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const void * i[2];\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", "", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" struct A * i[2];\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", "", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" const struct A * i[2];\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", "", errout.str());
functionVariableUsage("void foo(int n)\n"
"{\n"
" int i[n];\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i = 0;\n"
" int &j = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'j' is assigned a value that is never used.\n"
"[test.cpp:3]: (style) Variable 'i' is assigned a value that is never used.\n",
errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
" int &j = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'j' is assigned a value that is never used.\n"
"[test.cpp:3]: (style) Unused variable: i\n", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" int i;\n"
" int &j = i;\n"
" j = 0;\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'i' is assigned a value that is never used.\n",
"",
errout.str());
functionVariableUsage("double foo()\n"
"{\n"
" double i = 0.0;\n"
" const double j = i;\n"
" return j;\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo()\n"
"{\n"
" A * i;\n"
" i->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 <type-checks><unusedvar> 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());
functionVariableUsage("int f() {\n" // #9877
" const std::vector<int> x = get();\n"
" MACRO(2U, x.size())\n"
" int i = 0;\n"
" return i;\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<std::mutex> l{ m };\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("int func() {\n"
" std::shared_lock<std::shared_timed_mutex> 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<std::mutex> { 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());
functionVariableUsage("struct RAIIWrapper {\n" // #10894
" RAIIWrapper();\n"
" ~RAIIWrapper();\n"
"};\n"
"static void foo() {\n"
" auto const guard = RAIIWrapper();\n"
" auto const& guard2 = RAIIWrapper();\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<x_t> m_vec;\n"
" std::vector<x_t> Get(void);\n"
" void DoSomething();\n"
"};\n"
"std::vector<A::x_t> 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<int> 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<char> cmanifest = z;\n"
" return {.a = cmanifest, .b =0};\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void localvar60() {
functionVariableUsage("void Scale(double scale) {\n" // #10531
" for (int i = 0; i < m_points.size(); ++i) {\n"
" auto& p = m_points[i];\n"
" p += scale;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void foo(int c[]) {\n" // #10597
" int& cc = c[0];\n"
" cc &= ~0xff;\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 localvar65() {
functionVariableUsage("bool b();\n" // #9876
"void f() {\n"
" for (;;) {\n"
" const T* t = tok->next()->link()->next();\n"
" if (!b())\n"
" continue;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 't' is assigned a value that is never used.\n", errout.str());
functionVariableUsage("void f() {\n" // #10006
" std::string s = \"\";\n"
" try {}\n"
" catch (...) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 's' is assigned a value that is never used.\n", errout.str());
}
void localvar66() { // #11143
functionVariableUsage("void f() {\n"
" double phi = 42.0;\n"
" std::cout << pow(sin(phi), 2) + pow(cos(phi), 2) << std::endl;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void localvar67() { // #9946
functionVariableUsage("struct B {\n"
" virtual ~B() {}\n"
" bool operator() () const { return true; }\n"
" virtual bool f() const = 0;\n"
"};\n"
"class D : B {\n"
"public:\n"
" bool f() const override { return false; }\n"
"};\n"
"void f1() {\n"
" const D d1;\n"
" d1.f();\n"
"}\n"
"void f2() {\n"
" const D d2;\n"
" d2();\n"
" B() {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void localvar68() {
checkFunctionVariableUsageP("#define X0 int x = 0\n"
"void f() { X0; }\n");
ASSERT_EQUALS("", errout.str());
checkFunctionVariableUsageP("#define X0 int (*x)(int) = 0\n"
"void f() { X0; }\n");
ASSERT_EQUALS("", 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<int>& v) {\n"
" while (g()) {\n"
" const std::vector<int>& v2 = h();\n"
" if (std::vector<int>{ 1, 2, 3 }.size() > v2.size()) {}\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void f(const std::vector<int>& v) {\n"
" while (g()) {\n"
" const std::vector<int>& v2 = h();\n"
" if (std::vector<int>({ 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<std::string, std::vector<std::string>> m;\n"
" if (b) {\n"
" const std::string n = g();\n"
" std::vector<std::string> 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<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 = static_cast<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());
// 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<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 = static_cast<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("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<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 = static_cast<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("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<int>::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<std::string> 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 <type-checks><unusedvar> configuration for Fred\n", errout.str());
// extracttests.enable
functionVariableUsage("void f(std::pair<int,int> x) {\n"
" std::pair<int,int> 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<int,int> ints;\n"
" ints[0]= 1;\n"
" for each(std::pair<int,int> 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<int *> 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<int>(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<function_type>(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());
functionVariableUsage("int fun() {\n" // #11310
" static int k;\n"
" k++;\n"
" return k;\n"
"}\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<int> x;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unused variable: x\n", errout.str());
functionVariableUsage("void f() {\n"
" std::vector<int> 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<MyClass> x;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unused variable: x\n", errout.str());
functionVariableUsage("void f() {\n"
" std::lock_guard<MyClass> lock(mutex_);\n" // Has a side-effect #4385
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void f() {\n"
" pLocker = std::shared_ptr<jfxLocker>(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<std::mutex> lock(m);\n" // #4624
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void f() {\n" // #7732
" const std::pair<std::string, std::string> p(\"a\", \"b\");\n"
" std::pair<std::string, std::string> q{\"a\", \"b\" };\n"
" auto r = std::pair<std::string, std::string>(\"a\", \"b\");\n"
" auto s = std::pair<std::string, std::string>{ \"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());
functionVariableUsage("void f(std::span<int> s) {\n" // #11545
" s[0] = 0;\n"
"}\n");
ASSERT_EQUALS("", 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<A>();\n"
" auto a2 = std::unique_ptr<A>(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<A>();\n"
" auto a2 = std::unique_ptr<A>(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<S>();\n"
" p = nullptr;\n"
" g();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("int f(int *p) {\n" // #10703
" std::unique_ptr<int> up(p);\n"
" return *p;\n"
"}\n"
"int g(int* p) {\n"
" auto up = std::unique_ptr<int>(p);\n"
" return *p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("struct S { S(); };\n" // #11108
"void f(std::unique_ptr<S> p) {\n"
" p = nullptr;\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<int>& 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<int, double> 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 <type-checks><unusedvar> 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());
functionVariableUsage("void f() {\n"
" std::list<std::list<int>>::value_type a{ 1, 2, 3, 4 };\n"
"}\n");
TODO_ASSERT_EQUALS("", "[test.cpp:2]: (information) --check-library: Provide <type-checks><unusedvar> configuration for std::list::value_type\n", 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<int A> void f() {}\n"
"void foo() {\n"
" const int x = 0;\n"
" f<x>();\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void f() {\n"
" constexpr std::size_t ArraySize(5);\n"
" std::array<int, ArraySize> X; X.dostuff();\n"
"}");
ASSERT_EQUALS("", errout.str());
functionVariableUsage("void f() {\n" // #10686
" std::array<int, 1> 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<A> {};\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; ++i)\n"
" pdD[i] = (sum += pdD[i]);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void crash1() {
functionVariableUsage("SAL_WNODEPRECATED_DECLARATIONS_PUSH\n"
"void convertToTokenArray() {\n"
"}\n"
"SAL_WNODEPRECATED_DECLARATIONS_POP"); // #4033
}
void crash2() {
functionVariableUsage("template<unsigned dim>\n"
"struct Y: Y<dim-1> { };\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<int> 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<int> 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<BoostBox, size_t> 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<C> it) {\n"
" it = 123;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void escapeAlias() {
functionVariableUsage(
"struct A {\n"
" std::map<int, int> m;\n"
" void f(int key, int number) {\n"
" auto pos = m.find(key);\n"
" if (pos == m.end())\n"
" m.insert(std::map<int, int>::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)
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