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cppcheck/test/testother.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 "checkother.h"
#include "errortypes.h"
#include "helpers.h"
#include "platform.h"
#include "preprocessor.h"
#include "settings.h"
#include "standards.h"
#include "fixture.h"
#include "tokenize.h"
#include <sstream> // IWYU pragma: keep
#include <string>
#include <vector>
class TestOther : public TestFixture {
public:
TestOther() : TestFixture("TestOther") {}
private:
Settings _settings;
void run() override {
LOAD_LIB_2(_settings.library, "std.cfg");
TEST_CASE(emptyBrackets);
TEST_CASE(zeroDiv1);
TEST_CASE(zeroDiv2);
TEST_CASE(zeroDiv3);
TEST_CASE(zeroDiv4);
TEST_CASE(zeroDiv5);
TEST_CASE(zeroDiv6);
TEST_CASE(zeroDiv7); // #4930
TEST_CASE(zeroDiv8);
TEST_CASE(zeroDiv9);
TEST_CASE(zeroDiv10);
TEST_CASE(zeroDiv11);
TEST_CASE(zeroDiv12);
TEST_CASE(zeroDiv13);
TEST_CASE(zeroDiv14); // #1169
TEST_CASE(zeroDiv15); // #8319
TEST_CASE(zeroDiv16); // #11158
TEST_CASE(zeroDiv17); // #9931
TEST_CASE(zeroDiv18);
TEST_CASE(zeroDiv19);
TEST_CASE(zeroDivCond); // division by zero / useless condition
TEST_CASE(nanInArithmeticExpression);
TEST_CASE(varScope1);
TEST_CASE(varScope2);
TEST_CASE(varScope3);
TEST_CASE(varScope4);
TEST_CASE(varScope5);
TEST_CASE(varScope6);
TEST_CASE(varScope7);
TEST_CASE(varScope8);
TEST_CASE(varScope9); // classes may have extra side-effects
TEST_CASE(varScope10); // Undefined macro FOR
TEST_CASE(varScope11); // #2475 - struct initialization is not inner scope
TEST_CASE(varScope12);
TEST_CASE(varScope13); // variable usage in inner loop
TEST_CASE(varScope14);
TEST_CASE(varScope15); // #4573 if-else-if
TEST_CASE(varScope16);
TEST_CASE(varScope17);
TEST_CASE(varScope18);
TEST_CASE(varScope20); // Ticket #5103
TEST_CASE(varScope21); // Ticket #5382
TEST_CASE(varScope22); // Ticket #5684
TEST_CASE(varScope23); // Ticket #6154
TEST_CASE(varScope24); // pointer / reference
TEST_CASE(varScope25); // time_t
TEST_CASE(varScope26); // range for loop, map
TEST_CASE(varScope27); // #7733 - #if
TEST_CASE(varScope28); // #10527
TEST_CASE(varScope29); // #10888
TEST_CASE(varScope30); // #8541
TEST_CASE(varScope31); // #11099
TEST_CASE(varScope32); // #11441
TEST_CASE(varScope33);
TEST_CASE(varScope34);
TEST_CASE(varScope35);
TEST_CASE(oldStylePointerCast);
TEST_CASE(invalidPointerCast);
TEST_CASE(passedByValue);
TEST_CASE(passedByValue_nonConst);
TEST_CASE(passedByValue_externC);
TEST_CASE(constVariable);
TEST_CASE(constParameterCallback);
TEST_CASE(constPointer);
TEST_CASE(switchRedundantAssignmentTest);
TEST_CASE(switchRedundantOperationTest);
TEST_CASE(switchRedundantBitwiseOperationTest);
TEST_CASE(unreachableCode);
TEST_CASE(redundantContinue);
TEST_CASE(suspiciousCase);
TEST_CASE(suspiciousEqualityComparison);
TEST_CASE(suspiciousUnaryPlusMinus); // #8004
TEST_CASE(selfAssignment);
TEST_CASE(trac1132);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunction1);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunction2);
TEST_CASE(testMisusedScopeObjectPicksClass);
TEST_CASE(testMisusedScopeObjectPicksStruct);
TEST_CASE(testMisusedScopeObjectDoesNotPickIf);
TEST_CASE(testMisusedScopeObjectDoesNotPickConstructorDeclaration);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunctor);
TEST_CASE(testMisusedScopeObjectDoesNotPickLocalClassConstructors);
TEST_CASE(testMisusedScopeObjectDoesNotPickUsedObject);
TEST_CASE(testMisusedScopeObjectDoesNotPickPureC);
TEST_CASE(testMisusedScopeObjectDoesNotPickNestedClass);
TEST_CASE(testMisusedScopeObjectInConstructor);
TEST_CASE(testMisusedScopeObjectStandardType);
TEST_CASE(testMisusedScopeObjectNamespace);
TEST_CASE(testMisusedScopeObjectAssignment); // #11371
TEST_CASE(trac2071);
TEST_CASE(trac2084);
TEST_CASE(trac3693);
TEST_CASE(clarifyCalculation);
TEST_CASE(clarifyStatement);
TEST_CASE(duplicateBranch);
TEST_CASE(duplicateBranch1); // tests extracted by http://www.viva64.com/en/b/0149/ ( Comparison between PVS-Studio and cppcheck ): Errors detected in Quake 3: Arena by PVS-Studio: Fragment 2
TEST_CASE(duplicateBranch2); // empty macro
TEST_CASE(duplicateBranch3);
TEST_CASE(duplicateBranch4);
TEST_CASE(duplicateBranch5); // make sure the Token attributes are compared
TEST_CASE(duplicateBranch6);
TEST_CASE(duplicateExpression1);
TEST_CASE(duplicateExpression2); // ticket #2730
TEST_CASE(duplicateExpression3); // ticket #3317
TEST_CASE(duplicateExpression4); // ticket #3354 (++)
TEST_CASE(duplicateExpression5); // ticket #3749 (macros with same values)
TEST_CASE(duplicateExpression6); // ticket #4639
TEST_CASE(duplicateExpression7);
TEST_CASE(duplicateExpression8);
TEST_CASE(duplicateExpression9); // #9320
TEST_CASE(duplicateExpression10); // #9485
TEST_CASE(duplicateExpression11); // #8916 (function call)
TEST_CASE(duplicateExpression12); // #10026
TEST_CASE(duplicateExpression13); // #7899
TEST_CASE(duplicateExpression14); // #9871
TEST_CASE(duplicateExpression15); // #10650
TEST_CASE(duplicateExpression16); // #10569
TEST_CASE(duplicateExpression17); // #12036
TEST_CASE(duplicateExpressionLoop);
TEST_CASE(duplicateValueTernary);
TEST_CASE(duplicateExpressionTernary); // #6391
TEST_CASE(duplicateExpressionTemplate); // #6930
TEST_CASE(duplicateExpressionCompareWithZero);
TEST_CASE(oppositeExpression);
TEST_CASE(duplicateVarExpression);
TEST_CASE(duplicateVarExpressionUnique);
TEST_CASE(duplicateVarExpressionAssign);
TEST_CASE(duplicateVarExpressionCrash);
TEST_CASE(multiConditionSameExpression);
TEST_CASE(checkSignOfUnsignedVariable);
TEST_CASE(checkSignOfPointer);
TEST_CASE(checkSuspiciousSemicolon1);
TEST_CASE(checkSuspiciousSemicolon2);
TEST_CASE(checkSuspiciousSemicolon3);
TEST_CASE(checkSuspiciousComparison);
TEST_CASE(checkInvalidFree);
TEST_CASE(checkRedundantCopy);
TEST_CASE(checkNegativeShift);
TEST_CASE(incompleteArrayFill);
TEST_CASE(redundantVarAssignment);
TEST_CASE(redundantVarAssignment_trivial);
TEST_CASE(redundantVarAssignment_struct);
TEST_CASE(redundantVarAssignment_7133);
TEST_CASE(redundantVarAssignment_stackoverflow);
TEST_CASE(redundantVarAssignment_lambda);
TEST_CASE(redundantVarAssignment_loop);
TEST_CASE(redundantVarAssignment_after_switch);
TEST_CASE(redundantVarAssignment_pointer);
TEST_CASE(redundantVarAssignment_pointer_parameter);
TEST_CASE(redundantVarAssignment_array);
TEST_CASE(redundantVarAssignment_switch_break);
TEST_CASE(redundantInitialization);
TEST_CASE(redundantMemWrite);
TEST_CASE(varFuncNullUB);
TEST_CASE(checkCastIntToCharAndBack); // ticket #160
TEST_CASE(checkCommaSeparatedReturn);
TEST_CASE(checkPassByReference);
TEST_CASE(checkComparisonFunctionIsAlwaysTrueOrFalse);
TEST_CASE(integerOverflow); // #5895
TEST_CASE(redundantPointerOp);
TEST_CASE(test_isSameExpression);
TEST_CASE(raceAfterInterlockedDecrement);
TEST_CASE(testUnusedLabel);
TEST_CASE(testEvaluationOrder);
TEST_CASE(testEvaluationOrderSelfAssignment);
TEST_CASE(testEvaluationOrderMacro);
TEST_CASE(testEvaluationOrderSequencePointsFunctionCall);
TEST_CASE(testEvaluationOrderSequencePointsComma);
TEST_CASE(testEvaluationOrderSizeof);
TEST_CASE(testUnsignedLessThanZero);
TEST_CASE(doubleMove1);
TEST_CASE(doubleMoveMemberInitialization1);
TEST_CASE(doubleMoveMemberInitialization2);
TEST_CASE(doubleMoveMemberInitialization3); // #9974
TEST_CASE(doubleMoveMemberInitialization4);
TEST_CASE(moveAndAssign1);
TEST_CASE(moveAndAssign2);
TEST_CASE(moveAssignMoveAssign);
TEST_CASE(moveAndReset1);
TEST_CASE(moveAndReset2);
TEST_CASE(moveResetMoveReset);
TEST_CASE(moveAndFunctionParameter);
TEST_CASE(moveAndFunctionParameterReference);
TEST_CASE(moveAndFunctionParameterConstReference);
TEST_CASE(moveAndFunctionParameterUnknown);
TEST_CASE(moveAndReturn);
TEST_CASE(moveAndClear);
TEST_CASE(movedPointer);
TEST_CASE(moveAndAddressOf);
TEST_CASE(partiallyMoved);
TEST_CASE(moveAndLambda);
TEST_CASE(moveInLoop);
TEST_CASE(moveCallback);
TEST_CASE(moveClassVariable);
TEST_CASE(forwardAndUsed);
TEST_CASE(moveAndReference);
TEST_CASE(moveForRange);
TEST_CASE(funcArgNamesDifferent);
TEST_CASE(funcArgOrderDifferent);
TEST_CASE(cpp11FunctionArgInit); // #7846 - "void foo(int declaration = {}) {"
TEST_CASE(shadowVariables);
TEST_CASE(knownArgument);
TEST_CASE(knownArgumentHiddenVariableExpression);
TEST_CASE(knownArgumentTernaryOperator);
TEST_CASE(checkComparePointers);
TEST_CASE(unusedVariableValueTemplate); // #8994
TEST_CASE(moduloOfOne);
TEST_CASE(sameExpressionPointers);
TEST_CASE(checkOverlappingWrite);
TEST_CASE(constVariableArrayMember); // #10371
TEST_CASE(knownPointerToBool);
}
#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)
void check_(const char* file, int line, const char code[], const char *filename = nullptr, bool inconclusive = true, bool runSimpleChecks=true, bool verbose=false, Settings* settings = nullptr) {
// Clear the error buffer..
errout.str("");
if (!settings) {
settings = &_settings;
}
settings->severity.enable(Severity::style);
settings->severity.enable(Severity::warning);
settings->severity.enable(Severity::portability);
settings->severity.enable(Severity::performance);
settings->standards.c = Standards::CLatest;
settings->standards.cpp = Standards::CPPLatest;
settings->certainty.setEnabled(Certainty::inconclusive, inconclusive);
settings->verbose = verbose;
Preprocessor preprocessor(*settings);
// Tokenize..
Tokenizer tokenizer(settings, this, &preprocessor);
std::istringstream istr(code);
ASSERT_LOC(tokenizer.tokenize(istr, filename ? filename : "test.cpp"), file, line);
// Check..
runChecks<CheckOther>(tokenizer, this);
(void)runSimpleChecks; // TODO Remove this
}
void check_(const char* file, int line, const char code[], Settings *s) {
check_(file, line, code, "test.cpp", true, true, false, s);
}
#define checkP(...) checkP_(__FILE__, __LINE__, __VA_ARGS__)
void checkP_(const char* file, int line, const char code[], const char *filename = "test.cpp") {
// Clear the error buffer..
errout.str("");
Settings* settings = &_settings;
settings->severity.enable(Severity::style);
settings->severity.enable(Severity::warning);
settings->severity.enable(Severity::portability);
settings->severity.enable(Severity::performance);
settings->standards.c = Standards::CLatest;
settings->standards.cpp = Standards::CPPLatest;
settings->certainty.enable(Certainty::inconclusive);
Preprocessor preprocessor(*settings);
std::vector<std::string> files(1, filename);
Tokenizer tokenizer(settings, this, &preprocessor);
PreprocessorHelper::preprocess(preprocessor, code, files, tokenizer);
// Tokenizer..
ASSERT_LOC(tokenizer.simplifyTokens1(""), file, line);
// Check..
runChecks<CheckOther>(tokenizer, this);
}
void checkInterlockedDecrement(const char code[]) {
Settings settings;
settings.platform.type = Platform::Type::Win32A;
check(code, nullptr, false, true, false, &settings);
}
void emptyBrackets() {
check("{\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv1() { // floating point division by zero => no error
check("void foo() {\n"
" cout << 1. / 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" cout << 42 / (double)0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" cout << 42 / (float)0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" cout << 42 / (int)0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n", errout.str());
}
void zeroDiv2() {
check("void foo()\n"
"{\n"
" int sum = 0;\n"
" for(int i = 0; i < n; i ++)\n"
" {\n"
" sum += i;\n"
" }\n"
" cout<<b/sum;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv3() {
check("int foo(int i) {\n"
" return i / 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n", errout.str());
check("int foo(int i) {\n"
" return i % 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n", errout.str());
check("void foo(int& i) {\n"
" i /= 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n", errout.str());
check("void foo(int& i) {\n"
" i %= 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n", errout.str());
check("uint8_t foo(uint8_t i) {\n"
" return i / 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n", errout.str());
}
void zeroDiv4() {
check("void f()\n"
"{\n"
" long a = b / 0x6;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0x0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(long b)\n"
"{\n"
" long a = b / 0x0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero.\n", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0L;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(long b)\n"
"{\n"
" long a = b / 0L;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero.\n", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0ul;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(long b)\n"
"{\n"
" long a = b / 0ul;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero.\n", errout.str());
// Don't warn about floating points (gcc doesn't warn either)
// and floating points are handled differently than integers.
check("void f()\n"
"{\n"
" long a = b / 0.0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" long a = b / 0.5;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv5() {
check("void f()\n"
"{ { {\n"
" long a = b / 0;\n"
"} } }");
ASSERT_EQUALS("", errout.str());
check("void f(long b)\n"
"{ { {\n"
" long a = b / 0;\n"
"} } }");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero.\n", errout.str());
}
void zeroDiv6() {
check("void f()\n"
"{ { {\n"
" int a = b % 0;\n"
"} } }");
ASSERT_EQUALS("", errout.str());
check("void f(int b)\n"
"{ { {\n"
" int a = b % 0;\n"
"} } }");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero.\n", errout.str());
}
void zeroDiv7() {
// unknown types for x and y --> do not warn
check("void f() {\n"
" int a = x/2*3/0;\n"
" int b = y/2*3%0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" int a = x/2*3/0;\n"
" int b = y/2*3%0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n"
"[test.cpp:3]: (error) Division by zero.\n", errout.str());
}
void zeroDiv8() {
// #5584 - FP when function is unknown
check("void f() {\n"
" int a = 0;\n"
" do_something(a);\n"
" return 4 / a;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error, inconclusive) Division by zero.\n", errout.str());
}
void zeroDiv9() {
// #6403 FP zerodiv - inside protecting if-clause
check("void foo() {\n"
" double fStepHelp = 0;\n"
" if( (rOuterValue >>= fStepHelp) ) {\n"
" if( fStepHelp != 0.0) {\n"
" double fStepMain = 1;\n"
" sal_Int32 nIntervalCount = static_cast< sal_Int32 >(fStepMain / fStepHelp);\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv10() {
// #5402 false positive: (error) Division by zero -- with boost::format
check("int main() {\n"
" std::cout\n"
" << boost::format(\" %d :: %s <> %s\") % 0 % \"a\" % \"b\"\n"
" << std::endl;\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv11() {
check("void f(int a) {\n"
" int res = (a+2)/0;\n"
" int res = (a*2)/0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n"
"[test.cpp:3]: (error) Division by zero.\n", errout.str());
check("void f() {\n"
" int res = (a+2)/0;\n"
" int res = (a*2)/0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv12() {
// #8141
check("intmax_t f() {\n"
" return 1 / imaxabs(0);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n", errout.str());
}
void zeroDiv13() {
// #7324
check("int f () {\n"
" int dividend = 10;\n"
" int divisor = 1;\n"
" dividend = dividend / (--divisor);\n"
" return dividend;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Division by zero.\n", errout.str());
}
void zeroDiv14() {
check("void f() {\n" // #1169
" double dx = 1.;\n"
" int ix = 1;\n"
" int i = 1;\n"
" std::cout << ix / (i >> 1) << std::endl;\n"
" std::cout << dx / (i >> 1) << std::endl;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Division by zero.\n", errout.str());
}
void zeroDiv15() { // #8319
check("int f(int i) { return i - 1; }\n"
"int f() {\n"
" const int d = 1;\n"
" const int r = 1 / f(d);\n"
" return r;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Division by zero.\n", errout.str());
}
// #11158
void zeroDiv16()
{
check("int f(int i) {\n"
" int number = 10, a = 0;\n"
" for (int count = 0; count < 2; count++) {\n"
" a += (i / number) % 10;\n"
" number = number / 10;\n"
" }\n"
" return a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f(int i) {\n"
" int number = 10, a = 0;\n"
" for (int count = 0; count < 2; count++) {\n"
" int x = number / 10;\n"
" a += (i / number) % 10;\n"
" number = x;\n"
" }\n"
" return a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv17() { // #9931
check("int f(int len) {\n"
" int sz = sizeof(void*[255]) / 255;\n"
" int x = len % sz;\n"
" return x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv18()
{
check("int f(int x, int y) {\n"
" if (x == y) {}\n"
" return 1 / (x-y);\n"
"}\n");
ASSERT_EQUALS(
"[test.cpp:2] -> [test.cpp:3]: (warning) Either the condition 'x==y' is redundant or there is division by zero at line 3.\n",
errout.str());
}
void zeroDiv19()
{
check("void f() {\n" // #2456
" for (int i = 0;;)\n"
" int j = 10 / i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero.\n", errout.str());
}
void zeroDivCond() {
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x > 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (warning) Either the condition 'x>0' is redundant or there is division by zero at line 2.\n", errout.str());
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x >= 1) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (warning) Either the condition 'x>=1' is redundant or there is division by zero at line 2.\n", errout.str());
check("void f(int x) {\n"
" int y = 17 / x;\n"
" if (x == 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (warning) Either the condition 'x==0' is redundant or there is division by zero at line 2.\n", errout.str());
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (warning) Either the condition 'x!=0' is redundant or there is division by zero at line 2.\n", errout.str());
// function call
check("void f1(int x, int y) { c=x/y; }\n"
"void f2(unsigned int y) {\n"
" f1(123,y);\n"
" if (y>0){}\n"
"}");
ASSERT_EQUALS(
"[test.cpp:4] -> [test.cpp:1]: (warning) Either the condition 'y>0' is redundant or there is division by zero at line 1.\n",
errout.str());
// avoid false positives when variable is changed after division
check("void f() {\n"
" unsigned int x = do_something();\n"
" int y = 17 / x;\n"
" x = some+calculation;\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
{
// function is called that might modify global variable
check("void do_something();\n"
"int x;\n"
"void f() {\n"
" int y = 17 / x;\n"
" do_something();\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// function is called. but don't care, variable is local
check("void do_something();\n"
"void f() {\n"
" int x = some + calculation;\n"
" int y = 17 / x;\n"
" do_something();\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:4]: (warning) Either the condition 'x!=0' is redundant or there is division by zero at line 4.\n", errout.str());
}
check("void do_something(int value);\n"
"void f(int x) {\n"
" int y = 17 / x;\n"
" do_something(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int x;\n"
"void f() {\n"
" int y = 17 / x;\n"
" while (y || x == 0) { x--; }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ticket 5033 segmentation fault (valid code) in CheckOther::checkZeroDivisionOrUselessCondition
check("void f() {\n"
"double* p1= new double[1];\n"
"double* p2= new double[1];\n"
"double* p3= new double[1];\n"
"double* pp[3] = {p1,p2,p3};\n"
"}");
ASSERT_EQUALS("", errout.str());
// #5105 - FP
check("int f(int a, int b) {\n"
" int r = a / b;\n"
" if (func(b)) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// Unknown types for b and c --> do not warn
check("int f(int d) {\n"
" int r = (a?b:c) / d;\n"
" if (d == 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(int a) {\n"
" int r = a ? 1 / a : 0;\n"
" if (a == 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(int a) {\n"
" int r = (a == 0) ? 0 : 1 / a;\n"
" if (a == 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int g();\n"
"void f(int b) {\n"
" int x = g();\n"
" if (x == 0) {}\n"
" else if (x > 0) {}\n"
" else\n"
" a = b / -x;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" int x;\n"
"};\n"
"int f(A* a) {\n"
" if (a->x == 0) \n"
" a->x = 1;\n"
" return 1/a->x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #10049
check("int f(int argc) {\n"
" int quotient, remainder;\n"
" remainder = argc % 2;\n"
" argc = 2;\n"
" quotient = argc;\n"
" if (quotient != 0) \n"
" return quotient;\n"
" return remainder;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #11315
checkP("#define STATIC_ASSERT(c) \\\n"
"do { enum { sa = 1/(int)(!!(c)) }; } while (0)\n"
"void f() {\n"
" STATIC_ASSERT(sizeof(int) == sizeof(FOO));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #11505
check("void f(uint16_t num, uint8_t radix) {\n"
" int c = num % radix;\n"
" num /= radix;\n"
" if (!num) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void nanInArithmeticExpression() {
check("void f()\n"
"{\n"
" double x = 3.0 / 0.0 + 1.0;\n"
" printf(\"%f\", x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Using NaN/Inf in a computation.\n", errout.str());
check("void f()\n"
"{\n"
" double x = 3.0 / 0.0 - 1.0;\n"
" printf(\"%f\", x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Using NaN/Inf in a computation.\n", errout.str());
check("void f()\n"
"{\n"
" double x = 1.0 + 3.0 / 0.0;\n"
" printf(\"%f\", x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Using NaN/Inf in a computation.\n", errout.str());
check("void f()\n"
"{\n"
" double x = 1.0 - 3.0 / 0.0;\n"
" printf(\"%f\", x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Using NaN/Inf in a computation.\n", errout.str());
check("void f()\n"
"{\n"
" double x = 3.0 / 0.0;\n"
" printf(\"%f\", x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope1() {
check("unsigned short foo()\n"
"{\n"
" test_client CClient;\n"
" try\n"
" {\n"
" if (CClient.Open())\n"
" {\n"
" return 0;\n"
" }\n"
" }\n"
" catch (...)\n"
" {\n"
" return 2;\n"
" }\n"
"\n"
" try\n"
" {\n"
" CClient.Close();\n"
" }\n"
" catch (...)\n"
" {\n"
" return 2;\n"
" }\n"
"\n"
" return 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope2() {
check("int foo()\n"
"{\n"
" Error e;\n"
" e.SetValue(12);\n"
" throw e;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope3() {
check("void foo()\n"
"{\n"
" int i;\n"
" int *p = 0;\n"
" if (abc)\n"
" {\n"
" p = &i;\n"
" }\n"
" *p = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope4() {
check("void foo()\n"
"{\n"
" int i;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope5() {
check("void f(int x)\n"
"{\n"
" int i = 0;\n"
" if (x) {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) The scope of the variable 'i' can be reduced.\n", errout.str());
check("void f(int x) {\n"
" const unsigned char i = 0;\n"
" if (x) {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x)\n"
"{\n"
" int i = 0;\n"
" if (x) {b()}\n"
" else {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) The scope of the variable 'i' can be reduced.\n", errout.str());
}
void varScope6() {
check("void f(int x)\n"
"{\n"
" int i = x;\n"
" if (a) {\n"
" x++;\n"
" }\n"
" if (b) {\n"
" c(i);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #5398
" bool success = false;\n"
" int notReducable(someClass.getX(&success));\n"
" if (success) {\n"
" foo(notReducable);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(Test &test) {\n"
" int& x = test.getData();\n"
" if (test.process())\n"
" x = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
"int foo = 0;\n"
"std::vector<int> vec(10);\n"
"BOOST_FOREACH(int& i, vec)\n"
"{\n"
" foo += 1;\n"
" if(foo == 10)\n"
" {\n"
" return 0;\n"
" }\n"
"}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int &x)\n"
"{\n"
" int n = 1;\n"
" do\n"
" {\n"
" ++n;\n"
" ++x;\n"
" } while (x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope7() {
check("void f(int x)\n"
"{\n"
" int y = 0;\n"
" b(y);\n"
" if (x) {\n"
" y++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope8() {
check("void test() {\n"
" float edgeResistance=1;\n"
" std::vector<int> edges;\n"
" BOOST_FOREACH(int edge, edges) {\n"
" edgeResistance = (edge+1) / 2.0;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'edgeResistance' can be reduced.\n", errout.str());
}
void varScope9() {
// classes may have extra side effects
check("class fred {\n"
"public:\n"
" void x();\n"
"};\n"
"void test(int a) {\n"
" fred f;\n"
" if (a == 2) {\n"
" f.x();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope10() {
check("int f()\n"
"{\n"
" int x = 0;\n"
" FOR {\n"
" foo(x++);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope11() {
check("int f() {\n"
" int x = 0;\n"
" AB ab = { x, 0 };\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" int x = 0;\n"
" if (a == 0) { ++x; }\n"
" AB ab = { x, 0 };\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" int x = 0;\n"
" if (a == 0) { ++x; }\n"
" if (a == 1) { AB ab = { x, 0 }; }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope12() {
check("void f(int x) {\n"
" int i[5];\n"
" int* j = y;\n"
" if (x)\n"
" foo(i);\n"
" foo(j);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'i' can be reduced.\n", errout.str());
check("void f(int x) {\n"
" int i[5];\n"
" int* j;\n"
" if (x)\n"
" j = i;\n"
" foo(j);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" const bool b = true;\n"
" x++;\n"
" if (x == 5)\n"
" foo(b);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" const bool b = x;\n"
" x++;\n"
" if (x == 5)\n"
" foo(b);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope13() {
// #2770
check("void f() {\n"
" int i = 0;\n"
" forever {\n"
" if (i++ == 42) { break; }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope14() {
// #3941
check("void f() {\n"
" const int i( foo());\n"
" if(a) {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope15() {
// #4573
check("void f() {\n"
" int a,b,c;\n"
" if (a);\n"
" else if(b);\n"
" else if(c);\n"
" else;\n"
"}", nullptr, false);
ASSERT_EQUALS("", errout.str());
}
void varScope16() {
check("void f() {\n"
" int a = 0;\n"
" while((++a) < 56) {\n"
" foo();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 0;\n"
" do {\n"
" foo();\n"
" } while((++a) < 56);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 0;\n"
" do {\n"
" a = 64;\n"
" foo(a);\n"
" } while((++a) < 56);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 0;\n"
" do {\n"
" a = 64;\n"
" foo(a);\n"
" } while(z());\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'a' can be reduced.\n", errout.str());
}
void varScope17() {
check("void f() {\n"
" int x;\n"
" if (a) {\n"
" x = stuff(x);\n"
" morestuff(x);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'x' can be reduced.\n", errout.str());
check("void f() {\n"
" int x;\n"
" if (a) {\n"
" x = stuff(x);\n"
" morestuff(x);\n"
" }\n"
" if (b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'x' can be reduced.\n", errout.str());
}
void varScope18() {
check("void f() {\n"
" short x;\n"
"\n"
" switch (ab) {\n"
" case A:\n"
" break;\n"
" case B:\n"
" default:\n"
" break;\n"
" }\n"
"\n"
" if (c) {\n"
" x = foo();\n"
" do_something(x);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'x' can be reduced.\n", errout.str());
check("void f() {\n"
" short x;\n"
"\n"
" switch (ab) {\n"
" case A:\n"
" x = 10;\n"
" break;\n"
" case B:\n"
" default:\n"
" break;\n"
" }\n"
"\n"
" if (c) {\n"
" x = foo();\n"
" do_something(x);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" short x;\n"
"\n"
" switch (ab) {\n"
" case A:\n"
" if(c)\n"
" do_something(x);\n"
" break;\n"
" case B:\n"
" default:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'x' can be reduced.\n", errout.str());
check("void f() {\n"
" short x;\n"
"\n"
" switch (ab) {\n"
" case A:\n"
" if(c)\n"
" do_something(x);\n"
" break;\n"
" case B:\n"
" default:\n"
" if(d)\n"
" do_something(x);\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope20() { // Ticket #5103 - constant variable only used in inner scope
check("int f(int a) {\n"
" const int x = 234;\n"
" int b = a;\n"
" if (b > 32) b = x;\n"
" return b;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope21() { // Ticket #5382 - initializing two-dimensional array
check("int test() {\n"
" int test_value = 3;\n"
" int test_array[1][1] = { { test_value } };\n"
" return sizeof(test_array);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope22() { // Ticket #5684 - "The scope of the variable 'p' can be reduced" - But it can not.
check("void foo() {\n"
" int* p( 42 );\n"
" int i = 0;\n"
" while ( i != 100 ) {\n"
" *p = i;\n"
" ++p;\n"
" ++i;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// try to avoid an obvious false negative after applying the fix for the example above:
check("void foo() {\n"
" int* p( 42 );\n"
" int i = 0;\n"
" int dummy = 0;\n"
" while ( i != 100 ) {\n"
" p = & dummy;\n"
" *p = i;\n"
" ++p;\n"
" ++i;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'p' can be reduced.\n", errout.str());
}
void varScope23() { // #6154: Don't suggest to reduce scope if inner scope is a lambda
check("int main() {\n"
" size_t myCounter = 0;\n"
" Test myTest([&](size_t aX){\n"
" std::cout << myCounter += aX << std::endl;\n"
" });\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope24() {
check("void f(Foo x) {\n"
" Foo &r = x;\n"
" if (cond) {\n"
" r.dostuff();\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'r' can be reduced.\n", errout.str());
check("void f(Foo x) {\n"
" Foo foo = x;\n"
" if (cond) {\n"
" foo.dostuff();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope25() {
check("void f() {\n"
" time_t currtime;\n"
" if (a) {\n"
" currtime = time(&dummy);\n"
" if (currtime > t) {}\n"
" }\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:2]: (style) The scope of the variable 'currtime' can be reduced.\n", errout.str());
}
void varScope26() {
check("void f(const std::map<int,int> &m) {\n"
" for (auto it : m) {\n"
" if (cond1) {\n"
" int& key = it.first;\n"
" if (cond2) { dostuff(key); }\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope27() {
checkP("void f() {\n"
" int x = 0;\n"
"#ifdef X\n"
"#endif\n"
" if (id == ABC) { return x; }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkP("void f() {\n"
"#ifdef X\n"
"#endif\n"
" int x = 0;\n"
" if (id == ABC) { return x; }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) The scope of the variable 'x' can be reduced.\n", errout.str());
}
void varScope28() {
check("void f() {\n" // #10527
" int i{};\n"
" if (double d = g(i); d == 1.0) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope29() { // #10888
check("enum E { E0 };\n"
"struct S { int i; };\n"
"void f(int b) {\n"
" enum E e;\n"
" struct S s;\n"
" if (b) {\n"
" e = E0;\n"
" s.i = 0;\n"
" g(e, s);\n"
" }\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:4]: (style) The scope of the variable 'e' can be reduced.\n"
"[test.c:5]: (style) The scope of the variable 's' can be reduced.\n",
errout.str());
check("void f(bool b) {\n"
" std::string s;\n"
" if (b) {\n"
" s = \"abc\";\n"
" g(s);\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 's' can be reduced.\n", errout.str());
check("auto foo(std::vector<int>& vec, bool flag) {\n"
" std::vector<int> dummy;\n"
" std::vector<int>::iterator iter;\n"
" if (flag)\n"
" iter = vec.begin();\n"
" else {\n"
" dummy.push_back(42);\n"
" iter = dummy.begin();\n"
" }\n"
" return *iter;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'vec' can be declared as reference to const\n", errout.str());
check("auto& foo(std::vector<int>& vec, bool flag) {\n"
" std::vector<int> dummy;\n"
" std::vector<int>::iterator iter;\n"
" if (flag)\n"
" iter = vec.begin();\n"
" else {\n"
" dummy.push_back(42);\n"
" iter = dummy.begin();\n"
" }\n"
" return *iter;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope30() { // #8541
check("bool f(std::vector<int>& v, int i) {\n"
" int n = 0;\n"
" bool b = false;\n"
" std::for_each(v.begin(), v.end(), [&](int j) {\n"
" if (j == i) {\n"
" ++n;\n"
" if (n > 5)\n"
" b = true;\n"
" }\n"
" });\n"
" return b;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope31() { // #11099
check("bool g(std::vector<int>&);\n"
"void h(std::vector<int>);\n"
"void f0(std::vector<int> v) {\n"
" std::vector<int> w{ v };\n"
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f1(std::vector<int> v) {\n"
" std::vector<int> w{ v.begin(), v.end() };\n"
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f2(std::vector<int> v) {\n"
" std::vector<int> w{ 10, 0, std::allocator<int>() };\n" // FN
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f3(std::vector<int> v) {\n"
" std::vector<int> w{ 10, 0 };\n" // warn
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f4(std::vector<int> v) {\n"
" std::vector<int> w{ 10 };\n" // warn
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f5(std::vector<int> v) {\n"
" std::vector<int> w(v);\n"
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f6(std::vector<int> v) {\n"
" std::vector<int> w(v.begin(), v.end());\n"
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f7(std::vector<int> v) {\n"
" std::vector<int> w(10, 0, std::allocator<int>);\n" // FN
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f8(std::vector<int> v) {\n"
" std::vector<int> w(10, 0);\n" // warn
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f9(std::vector<int> v) {\n"
" std::vector<int> w(10);\n" // warn
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n"
"void f10(std::vector<int> v) {\n"
" std::vector<int> w{};\n" // warn
" bool b = g(v);\n"
" if (b)\n"
" h(w);\n"
" h(v);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:25]: (style) The scope of the variable 'w' can be reduced.\n"
"[test.cpp:32]: (style) The scope of the variable 'w' can be reduced.\n"
"[test.cpp:60]: (style) The scope of the variable 'w' can be reduced.\n"
"[test.cpp:67]: (style) The scope of the variable 'w' can be reduced.\n"
"[test.cpp:74]: (style) The scope of the variable 'w' can be reduced.\n",
errout.str());
}
void varScope32() { // #11441
check("template <class F>\n"
"std::vector<int> g(F, const std::vector<int>&);\n"
"void f(const std::vector<int>&v) {\n"
" std::vector<int> w;\n"
" for (auto x : v)\n"
" w = g([&]() { x; }, w);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (warning) Unused variable value 'x'\n", errout.str());
}
void varScope33() { // #11131
check("struct S {\n"
" const std::string& getStr() const;\n"
" void mutate();\n"
" bool getB() const;\n"
"};\n"
"void g(S& s) {\n"
" std::string str = s.getStr();\n"
" s.mutate();\n"
" if (s.getB()) {\n"
" if (str == \"abc\") {}\n"
" }\n"
"}\n"
"void g(char* s, bool b) {\n"
" int i = strlen(s);\n"
" s[0] = '\\0';\n"
" if (b) {\n"
" if (i == 5) {}\n"
" }\n"
"}\n"
"void f(const S& s) {\n"
" std::string str = s.getStr();\n"
" std::string str2{ s.getStr() };\n"
" std::string str3(s.getStr());\n"
" if (s.getB()) {\n"
" if (str == \"abc\") {}\n"
" if (str2 == \"abc\") {}\n"
" if (str3 == \"abc\") {}\n"
" }\n"
"}\n"
"void f(const char* s, bool b) {\n"
" int i = strlen(s);\n"
" if (b) {\n"
" if (i == 5) {}\n"
" }\n"
"}\n"
"void f(int j, bool b) {\n"
" int k = j;\n"
" if (b) {\n"
" if (k == 5) {}\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:21]: (style) The scope of the variable 'str' can be reduced.\n"
"[test.cpp:22]: (style) The scope of the variable 'str2' can be reduced.\n"
"[test.cpp:23]: (style) The scope of the variable 'str3' can be reduced.\n"
"[test.cpp:31]: (style) The scope of the variable 'i' can be reduced.\n"
"[test.cpp:37]: (style) The scope of the variable 'k' can be reduced.\n",
errout.str());
}
void varScope34() { // #11742
check("void f() {\n"
" bool b = false;\n"
" int i = 1;\n"
" for (int k = 0; k < 20; ++k) {\n"
" b = !b;\n"
" if (b)\n"
" i++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varScope35() { // #11845
check("void f(int err, const char* src) {\n"
" const char* msg = \"Success\";\n"
" char buf[42];\n"
" if (err != 0)\n"
" msg = strcpy(buf, src);\n"
" printf(\"%d: %s\\n\", err, msg);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("char* g(char* dst, const char* src);\n"
"void f(int err, const char* src) {\n"
" const char* msg = \"Success\";\n"
" char buf[42];\n"
" if (err != 0)\n"
" msg = g(buf, src);\n"
" printf(\"%d: %s\\n\", err, msg);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("char* g(char* dst, const char* src);\n"
"void f(int err, const char* src) {\n"
" const char* msg = \"Success\";\n"
" char buf[42];\n"
" if (err != 0)\n"
" g(buf, src);\n"
" printf(\"%d: %s\\n\", err, msg);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) The scope of the variable 'buf' can be reduced.\n", errout.str());
}
#define checkOldStylePointerCast(code) checkOldStylePointerCast_(code, __FILE__, __LINE__)
void checkOldStylePointerCast_(const char code[], const char* file, int line) {
// Clear the error buffer..
errout.str("");
// #5560 - set c++03
const Settings settings = settingsBuilder().severity(Severity::style).cpp(Standards::CPP03).build();
Preprocessor preprocessor(settings);
// Tokenize..
Tokenizer tokenizerCpp(&settings, this, &preprocessor);
std::istringstream istr(code);
ASSERT_LOC(tokenizerCpp.tokenize(istr, "test.cpp"), file, line);
CheckOther checkOtherCpp(&tokenizerCpp, &settings, this);
checkOtherCpp.warningOldStylePointerCast();
}
void oldStylePointerCast() {
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (Base *) derived;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base *) derived;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base * const) derived;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (volatile Base *) derived;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (volatile Base * const) derived;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const volatile Base *) derived;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const volatile Base * const) derived;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base *) ( new Derived() );\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base *) new Derived();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class Base;\n"
"void foo()\n"
"{\n"
" Base * b = (const Base *) new short[10];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class B;\n"
"class A\n"
"{\n"
" virtual void abc(B *) const = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkOldStylePointerCast("class B;\n"
"class A\n"
"{\n"
" virtual void abc(const B *) const = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3630
checkOldStylePointerCast("class SomeType;\n"
"class X : public Base {\n"
" X() : Base((SomeType*)7) {}\n"
"};");
ASSERT_EQUALS("[test.cpp:3]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class SomeType;\n"
"class X : public Base {\n"
" X() : Base((SomeType*)var) {}\n"
"};");
ASSERT_EQUALS("[test.cpp:3]: (style) C-style pointer casting\n", errout.str());
checkOldStylePointerCast("class SomeType;\n"
"class X : public Base {\n"
" X() : Base((SomeType*)0) {}\n"
"};");
ASSERT_EQUALS("", errout.str());
// #5560
checkOldStylePointerCast("class C;\n"
"\n"
"class B\n"
"{ virtual G* createGui(S*, C*) const = 0; };\n"
"\n"
"class MS : public M\n"
"{ virtual void addController(C*) override {} };");
ASSERT_EQUALS("", errout.str());
// #6164
checkOldStylePointerCast("class Base {};\n"
"class Derived: public Base {};\n"
"void testCC() {\n"
" std::vector<Base*> v;\n"
" v.push_back((Base*)new Derived);\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) C-style pointer casting\n", errout.str());
// #7709
checkOldStylePointerCast("typedef struct S S;\n"
"typedef struct S SS;\n"
"typedef class C C;\n"
"typedef long LONG;\n"
"typedef long* LONGP;\n"
"struct T {};\n"
"typedef struct T TT;\n"
"typedef struct T2 {} TT2;\n"
"void f(int* i) {\n"
" S* s = (S*)i;\n"
" SS* ss = (SS*)i;\n"
" struct S2* s2 = (struct S2*)i;\n"
" C* c = (C*)i;\n"
" class C2* c2 = (class C2*)i;\n"
" long* l = (long*)i;\n"
" LONG* l2 = (LONG*)i;\n"
" LONGP l3 = (LONGP)i;\n"
" TT* tt = (TT*)i;\n"
" TT2* tt2 = (TT2*)i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (style) C-style pointer casting\n"
"[test.cpp:11]: (style) C-style pointer casting\n"
"[test.cpp:12]: (style) C-style pointer casting\n"
"[test.cpp:13]: (style) C-style pointer casting\n"
"[test.cpp:14]: (style) C-style pointer casting\n"
"[test.cpp:15]: (style) C-style pointer casting\n"
"[test.cpp:16]: (style) C-style pointer casting\n"
"[test.cpp:17]: (style) C-style pointer casting\n"
"[test.cpp:18]: (style) C-style pointer casting\n"
"[test.cpp:19]: (style) C-style pointer casting\n",
errout.str());
// #8649
checkOldStylePointerCast("struct S {};\n"
"void g(S*& s);\n"
"void f(int i) {\n"
" g((S*&)i);\n"
" S*& r = (S*&)i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n"
"[test.cpp:5]: (style) C-style pointer casting\n",
errout.str());
// #10823
checkOldStylePointerCast("void f(void* p) {\n"
" auto h = reinterpret_cast<void (STDAPICALLTYPE*)(int)>(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #5210
checkOldStylePointerCast("void f(void* v1, void* v2) {\n"
" T** p1 = (T**)v1;\n"
" T*** p2 = (T***)v2;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) C-style pointer casting\n"
"[test.cpp:3]: (style) C-style pointer casting\n",
errout.str());
}
#define checkInvalidPointerCast(...) checkInvalidPointerCast_(__FILE__, __LINE__, __VA_ARGS__)
void checkInvalidPointerCast_(const char* file, int line, const char code[], bool portability = true, bool inconclusive = false) {
// Clear the error buffer..
errout.str("");
Settings settings = settingsBuilder().severity(Severity::warning).severity(Severity::portability, portability).certainty(Certainty::inconclusive, inconclusive).build();
settings.platform.defaultSign = 's';
Preprocessor preprocessor(settings);
// Tokenize..
Tokenizer tokenizer(&settings, this, &preprocessor);
std::istringstream istr(code);
ASSERT_LOC(tokenizer.tokenize(istr, "test.cpp"), file, line);
CheckOther checkOtherCpp(&tokenizer, &settings, this);
checkOtherCpp.invalidPointerCast();
}
void invalidPointerCast() {
checkInvalidPointerCast("void test() {\n"
" float *f = new float[10];\n"
" delete [] (double*)f;\n"
" delete [] (long double const*)(new float[10]);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability) Casting between float * and double * which have an incompatible binary data representation.\n"
"[test.cpp:4]: (portability) Casting between float * and const long double * which have an incompatible binary data representation.\n", errout.str());
checkInvalidPointerCast("void test(const float* f) {\n"
" double *d = (double*)f;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) Casting between const float * and double * which have an incompatible binary data representation.\n", errout.str());
checkInvalidPointerCast("void test(double* d1) {\n"
" long double *ld = (long double*)d1;\n"
" double *d2 = (double*)ld;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) Casting between double * and long double * which have an incompatible binary data representation.\n"
"[test.cpp:3]: (portability) Casting between long double * and double * which have an incompatible binary data representation.\n", errout.str());
checkInvalidPointerCast("char* test(int* i) {\n"
" long double *d = (long double*)(i);\n"
" double *d = (double*)(i);\n"
" float *f = reinterpret_cast<float*>(i);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) Casting between signed int * and long double * which have an incompatible binary data representation.\n"
"[test.cpp:3]: (portability) Casting between signed int * and double * which have an incompatible binary data representation.\n"
"[test.cpp:4]: (portability) Casting between signed int * and float * which have an incompatible binary data representation.\n", errout.str());
checkInvalidPointerCast("float* test(unsigned int* i) {\n"
" return (float*)i;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) Casting between unsigned int * and float * which have an incompatible binary data representation.\n", errout.str());
checkInvalidPointerCast("float* test(unsigned int* i) {\n"
" return (float*)i[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInvalidPointerCast("float* test(double& d) {\n"
" return (float*)&d;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) Casting between double * and float * which have an incompatible binary data representation.\n", errout.str());
checkInvalidPointerCast("void test(float* data) {\n"
" f.write((char*)data,sizeof(float));\n"
"}", true, false);
ASSERT_EQUALS("", errout.str());
checkInvalidPointerCast("void test(float* data) {\n"
" f.write((char*)data,sizeof(float));\n"
"}", true, true); // #3639
ASSERT_EQUALS("[test.cpp:2]: (portability, inconclusive) Casting from float * to signed char * is not portable due to different binary data representations on different platforms.\n", errout.str());
checkInvalidPointerCast("long long* test(float* f) {\n"
" return (long long*)f;\n"
"}", false);
ASSERT_EQUALS("", errout.str());
checkInvalidPointerCast("long long* test(float* f, char* c) {\n"
" foo((long long*)f);\n"
" return reinterpret_cast<long long*>(c);\n"
"}", true);
ASSERT_EQUALS("[test.cpp:2]: (portability) Casting from float * to signed long long * is not portable due to different binary data representations on different platforms.\n", errout.str());
checkInvalidPointerCast("Q_DECLARE_METATYPE(int*)"); // #4135 - don't crash
}
void passedByValue() {
check("void f(const std::string str) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("void f(std::unique_ptr<std::string> ptr) {}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::shared_ptr<std::string> ptr) {}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::function<F> ptr) {}");
ASSERT_EQUALS("", errout.str());
{
check("void f(const std::pair<int,int> x) {}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::pair<std::string,std::string> x) {}");
TODO_ASSERT_EQUALS("error", "", errout.str());
}
check("void f(const std::string::size_type x) {}");
ASSERT_EQUALS("", errout.str());
check("class Foo;\nvoid f(const Foo foo) {}"); // Unknown class
ASSERT_EQUALS("[test.cpp:2]: (performance, inconclusive) Function parameter 'foo' should be passed by const reference.\n", errout.str());
check("class Foo { std::vector<int> v; };\nvoid f(const Foo foo) {}"); // Large class (STL member)
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'foo' should be passed by const reference.\n", errout.str());
check("class Foo { int i; };\nvoid f(const Foo foo) {}"); // Small class
ASSERT_EQUALS("", errout.str());
check("class Foo { int i[6]; };\nvoid f(const Foo foo) {}"); // Large class (array)
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'foo' should be passed by const reference.\n", errout.str());
check("class Foo { std::string* s; };\nvoid f(const Foo foo) {}"); // Small class (pointer)
ASSERT_EQUALS("", errout.str());
check("class Foo { static std::string s; };\nvoid f(const Foo foo) {}"); // Small class (static member)
ASSERT_EQUALS("", errout.str());
check("class X { std::string s; }; class Foo : X { };\nvoid f(const Foo foo) {}"); // Large class (inherited)
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'foo' should be passed by const reference.\n", errout.str());
check("class X { std::string s; }; class Foo { X x; };\nvoid f(const Foo foo) {}"); // Large class (inherited)
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'foo' should be passed by const reference.\n", errout.str());
check("void f(const std::string &str) {}");
ASSERT_EQUALS("", errout.str());
// The idiomatic way of passing a std::string_view is by value
check("void f(const std::string_view str) {}");
ASSERT_EQUALS("", errout.str());
check("void f(std::string_view str) {}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::string_view &str) {}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::vector<int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("void f(const std::vector<std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("void f(const std::vector<std::string>::size_type s) {}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::vector<int> &v) {}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::map<int,int> &v) {}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::map<int,int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("void f(const std::map<std::string,std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("void f(const std::map<int,std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("void f(const std::map<std::string,int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("void f(const std::streamoff pos) {}");
ASSERT_EQUALS("", errout.str());
check("void f(std::initializer_list<int> i) {}");
ASSERT_EQUALS("", errout.str());
// #5824
check("void log(const std::string& file, int line, const std::string& function, const std::string str, ...) {}");
ASSERT_EQUALS("", errout.str());
// #5534
check("struct float3 { };\n"
"typedef float3 vec;\n"
"class Plane {\n"
" vec Refract(vec &vec) const;\n"
" bool IntersectLinePlane(const vec &planeNormal);\n"
"};");
ASSERT_EQUALS("", errout.str());
check("class X {\n"
" virtual void func(const std::string str) {}\n"
"};");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("enum X;\n"
"void foo(X x1){}\n");
ASSERT_EQUALS("", errout.str());
check("enum X { a, b, c };\n"
"void foo(X x2){}\n");
ASSERT_EQUALS("", errout.str());
check("enum X { a, b, c };\n"
"enum X;"
"void foo(X x3){}\n");
ASSERT_EQUALS("", errout.str());
check("enum X;\n"
"enum X { a, b, c };"
"void foo(X x4){}\n");
ASSERT_EQUALS("", errout.str());
check("union U {\n"
" char* pc;\n"
" short* ps;\n"
" int* pi;\n"
"};\n"
"void f(U u) {}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { char A[8][8]; };\n"
"void f(S s) {}\n");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 's' should be passed by const reference.\n", errout.str());
check("union U {\n" // don't crash
" int a;\n"
" decltype(nullptr) b;\n"
"};\n"
"int* f(U u) { return u.b; }\n");
ASSERT_EQUALS("", errout.str());
check("struct B { virtual int f(std::string s) = 0; };\n" // #11432
"struct D1 : B {\n"
" int f(std::string s) override { s += 'a'; return s.size(); }\n"
"}\n"
"struct D2 : B {\n"
" int f(std::string s) override { return s.size(); }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int x(int);\n"
"void f(std::vector<int> v, int& j) {\n"
" for (int i : v)\n"
" j = i;\n"
"}\n"
"void fn(std::vector<int> v) {\n"
" for (int& i : v)\n"
" i = x(i);\n"
"}\n"
"void g(std::vector<int> v, int& j) {\n"
" for (int i = 0; i < v.size(); ++i)\n"
" j = v[i];\n"
"}\n"
"void gn(std::vector<int> v) {\n"
" for (int i = 0; i < v.size(); ++i)\n"
" v[i] = x(i);\n"
"}\n"
"void h(std::vector<std::vector<int>> v, int& j) {\n"
" for (int i = 0; i < v.size(); ++i)\n"
" j = v[i][0];\n"
"}\n"
"void hn(std::vector<std::vector<int>> v) {\n"
" for (int i = 0; i < v.size(); ++i)\n"
" v[i][0] = x(i);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'v' should be passed by const reference.\n"
"[test.cpp:10]: (performance) Function parameter 'v' should be passed by const reference.\n"
"[test.cpp:18]: (performance) Function parameter 'v' should be passed by const reference.\n",
errout.str());
check("struct S {\n" // #11995
" explicit S(std::string s) noexcept;\n"
" std::string m;\n"
"};\n"
"S::S(std::string s) noexcept : m(std::move(s)) {}\n"
"struct T {\n"
" explicit S(std::string s) noexcept(true);\n"
" std::string m;\n"
"};\n"
"T::T(std::string s) noexcept(true) : m(std::move(s)) {}\n");
ASSERT_EQUALS("", errout.str());
check("namespace N {\n" // #12086
" void g(int);\n"
"}\n"
"void f(std::vector<int> v) {\n"
" N::g(v[0]);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("void f(const std::string& s, std::string t) {\n" // #12083
" const std::string& v = !s.empty() ? s : t;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 't' should be passed by const reference.\n", errout.str());
check("struct S {\n" // #12138
" union {\n"
" int a = 0;\n"
" int x;\n"
" };\n"
" union {\n"
" int b = 0;\n"
" int y;\n"
" };\n"
" union {\n"
" int c = 0;\n"
" int z;\n"
" };\n"
"};\n"
"void f(S s) {\n"
" if (s.x > s.y) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { std::list<int> l; };\n" // #12147
"class C { public: std::list<int> l; };\n"
"bool f(S s) {\n"
" return s.l.empty();\n"
"}\n"
"bool f(C c) {\n"
" return c.l.empty();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (performance) Function parameter 's' should be passed by const reference.\n"
"[test.cpp:6]: (performance) Function parameter 'c' should be passed by const reference.\n",
errout.str());
check("struct S { std::list<int> a[1][1]; };\n"
"bool f(S s) {\n"
" return s.a[0][0].empty();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 's' should be passed by const reference.\n",
errout.str());
Settings settings1 = settingsBuilder().platform(Platform::Type::Win64).build();
check("using ui64 = unsigned __int64;\n"
"ui64 Test(ui64 one, ui64 two) { return one + two; }\n",
/*filename*/ nullptr, /*inconclusive*/ true, /*runSimpleChecks*/ true, /*verbose*/ false, &settings1);
ASSERT_EQUALS("", errout.str());
}
void passedByValue_nonConst() {
check("void f(std::string str) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("void f(std::string str) {\n"
" return str + x;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("void f(std::string str) {\n"
" std::cout << str;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("void f(std::string str) {\n"
" std::cin >> str;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::string str) {\n"
" std::string s2 = str;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("void f(std::string str) {\n"
" std::string& s2 = str;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by const reference.\n"
"[test.cpp:2]: (style) Variable 's2' can be declared as reference to const\n",
errout.str());
check("void f(std::string str) {\n"
" const std::string& s2 = str;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("void f(std::string str) {\n"
" str = \"\";\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::string str) {\n"
" foo(str);\n" // It could be that foo takes str as non-const-reference
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const std::string& str);\n"
"void f(std::string str) {\n"
" foo(str);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("void foo(std::string str);\n"
"void f(std::string str) {\n"
" foo(str);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("void foo(std::string& str);\n"
"void f(std::string str) {\n"
" foo(str);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(std::string* str);\n"
"void f(std::string str) {\n"
" foo(&str);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int& i1, const std::string& str, int& i2);\n"
"void f(std::string str) {\n"
" foo((a+b)*c, str, x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("std::string f(std::string str) {\n"
" str += x;\n"
" return str;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class X {\n"
" std::string s;\n"
" void func() const;\n"
"};\n"
"Y f(X x) {\n"
" x.func();\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (performance) Function parameter 'x' should be passed by const reference.\n", errout.str());
check("class X {\n"
" void func();\n"
"};\n"
"Y f(X x) {\n"
" x.func();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class X {\n"
" void func(std::string str) {}\n"
"};");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'str' should be passed by const reference.\n", errout.str());
check("class X {\n"
" virtual void func(std::string str) {}\n" // Do not warn about virtual functions, if 'str' is not declared as const
"};");
ASSERT_EQUALS("", errout.str());
check("class X {\n"
" char a[1024];\n"
"};\n"
"class Y : X {\n"
" char b;\n"
"};\n"
"void f(Y y) {\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (performance) Function parameter 'y' should be passed by const reference.\n", errout.str());
check("class X {\n"
" void* a;\n"
" void* b;\n"
"};\n"
"class Y {\n"
" void* a;\n"
" void* b;\n"
" char c;\n"
"};\n"
"void f(X x, Y y) {\n"
"}");
ASSERT_EQUALS("[test.cpp:10]: (performance) Function parameter 'y' should be passed by const reference.\n", errout.str());
{
// 8-byte data should be passed by const reference on 32-bit platform but not on 64-bit platform
const char code[] = "class X {\n"
" uint64_t a;\n"
" uint64_t b;\n"
"};\n"
"void f(X x) {}";
Settings s32 = settingsBuilder(_settings).platform(Platform::Type::Unix32).build();
check(code, &s32);
ASSERT_EQUALS("[test.cpp:5]: (performance) Function parameter 'x' should be passed by const reference.\n", errout.str());
Settings s64 = settingsBuilder(_settings).platform(Platform::Type::Unix64).build();
check(code, &s64);
ASSERT_EQUALS("", errout.str());
}
check("Writer* getWriter();\n"
"\n"
"void foo(Buffer& buffer) {\n"
" getWriter()->operator<<(buffer);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void passedByValue_externC() {
check("struct X { int a[5]; }; void f(X v) { }");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("extern \"C\" { struct X { int a[5]; }; void f(X v) { } }");
ASSERT_EQUALS("", errout.str());
check("struct X { int a[5]; }; extern \"C\" void f(X v) { }");
ASSERT_EQUALS("", errout.str());
check("struct X { int a[5]; }; void f(const X v);");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by const reference.\n", errout.str());
check("extern \"C\" { struct X { int a[5]; }; void f(const X v); }");
ASSERT_EQUALS("", errout.str());
check("struct X { int a[5]; }; extern \"C\" void f(const X v) { }");
ASSERT_EQUALS("", errout.str());
}
void constVariable() {
check("int f(std::vector<int> x) {\n"
" int& i = x[0];\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'x' should be passed by const reference.\n"
"[test.cpp:2]: (style) Variable 'i' can be declared as reference to const\n",
errout.str());
check("int f(std::vector<int>& x) {\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("int f(std::vector<int> x) {\n"
" const int& i = x[0];\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'x' should be passed by const reference.\n", errout.str());
check("int f(std::vector<int> x) {\n"
" static int& i = x[0];\n"
" return i;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'x' should be passed by const reference.\n", errout.str());
check("int f(std::vector<int> x) {\n"
" int& i = x[0];\n"
" i++;\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int& f(std::vector<int>& x) {\n"
" x.push_back(1);\n"
" int& i = x[0];\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(const std::vector<int>& x) {\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int& f(std::vector<int>& x) {\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("const int& f(std::vector<int>& x) {\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("int f(std::vector<int>& x) {\n"
" x[0]++;\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A { int a; };\n"
"A f(std::vector<A>& x) {\n"
" x[0].a = 1;\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A { int a(); };\n"
"A f(std::vector<A>& x) {\n"
" x[0].a();\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int g(int& x);\n"
"int f(std::vector<int>& x) {\n"
" g(x[0]);\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("template<class T>\n"
"T f(T& x) {\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("template<class T>\n"
"T f(T&& x) {\n"
" return x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("template<class T>\n"
"T f(T& x) {\n"
" return x[0];\n"
"}\n"
"void h() { std::vector<int> v; h(v); }");
ASSERT_EQUALS("", errout.str());
check("int f(int& x) {\n"
" return std::move(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::ostream& os) {\n"
" os << \"Hello\";\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void g(int*);\n"
"void f(int& x) {\n"
" g(&x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A { A(int*); };\n"
"A f(int& x) {\n"
" return A(&x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A { A(int*); };\n"
"A f(int& x) {\n"
" return A{&x};\n"
"}");
ASSERT_EQUALS("", errout.str());
// Perhaps unused variable should be checked as well.
check("void f(int& x, int& y) {\n"
" y++;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" explicit A(int& y) : x(&y) {}\n"
" int * x = nullptr;\n"
"};");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" std::vector<int> v;\n"
" void swap(A& a) {\n"
" v.swap(a.v);\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" template<class T>\n"
" void f();\n"
" template<class T>\n"
" void f() const;\n"
"};\n"
"void g(A& a) {\n"
" a.f<int>();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int>& v) {\n"
" for(auto&& x:v)\n"
" x = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int>& v) {\n"
" for(auto x:v)\n"
" x = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'v' can be declared as reference to const\n", errout.str());
check("void f(std::vector<int>& v) {\n"
" for(auto& x:v) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' can be declared as reference to const\n",
errout.str());
check("void f(std::vector<int>& v) {\n" // #10980
" for (int& i : v)\n"
" if (i == 0) {}\n"
" for (const int& i : v)\n"
" if (i == 0) {}\n"
" for (auto& i : v)\n"
" if (i == 0) {}\n"
" for (const auto& i : v)\n"
" if (i == 0) {}\n"
" v.clear();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'i' can be declared as reference to const\n"
"[test.cpp:6]: (style) Variable 'i' can be declared as reference to const\n",
errout.str());
check("void f(std::vector<int>& v) {\n"
" for(const auto& x:v) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'v' can be declared as reference to const\n", errout.str());
check("void f(int& i) {\n"
" int& j = i;\n"
" j++;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int>& v) {\n"
" int& i = v[0];\n"
" i++;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::map<unsigned int, std::map<std::string, unsigned int> >& m, unsigned int i) {\n"
" std::map<std::string, unsigned int>& members = m[i];\n"
" members.clear();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" int& x;\n"
" A(int& y) : x(y)\n"
" {}\n"
"};");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" A(int& x);\n"
"};\n"
"struct B : A {\n"
" B(int& x) : A(x)\n"
" {}\n"
"};");
ASSERT_EQUALS("", errout.str());
check("void f(bool b, int& x, int& y) {\n"
" auto& z = x;\n"
" auto& w = b ? y : z;\n"
" w = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct S {\n"
" int i;\n"
"};\n"
"int& f(S& s) {\n"
" return s.i;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int* f(std::list<int>& x, unsigned int y) {\n"
" for (int& m : x) {\n"
" if (m == y)\n"
" return &m;\n"
" }\n"
" return nullptr;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int& f(std::list<int>& x, int& y) {\n"
" for (int& m : x) {\n"
" if (m == y)\n"
" return m;\n"
" }\n"
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("bool from_string(int& t, const std::string& s) {\n"
" std::istringstream iss(s);\n"
" return !(iss >> t).fail();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #9710
check("class a {\n"
" void operator()(int& i) const {\n"
" i++;\n"
" }\n"
"};\n"
"void f(int& i) {\n"
" a()(i);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("class a {\n"
" void operator()(int& i) const {\n"
" i++;\n"
" }\n"
"};\n"
"void f(int& i) {\n"
" a x;\n"
" x(i);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("class a {\n"
" void operator()(const int& i) const;\n"
"};\n"
"void f(int& i) {\n"
" a x;\n"
" x(i);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'i' can be declared as reference to const\n", errout.str());
//cast or assignment to a non-const reference should prevent the warning
check("struct T { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const T& z = x;\n" // Make sure we find all assignments
" T& y = x;\n"
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U& y = x\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U& y = x;\n"
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" my<fancy>::type& y = x;\n" // we don't know if y is const or not
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U& y = static_cast<const U&>(x);\n"
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U& y = static_cast<U&>(x);\n"
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U& y = dynamic_cast<const U&>(x)\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U& y = dynamic_cast<U const &>(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U& y = dynamic_cast<U & const>(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U& y = dynamic_cast<U&>(x);\n"
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U& y = dynamic_cast<typename const U&>(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U& y = dynamic_cast<typename U&>(x);\n"
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U* y = dynamic_cast<U*>(&x);\n"
" y->mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U * y = dynamic_cast<const U *>(&x);\n"
" y->mutate();\n" // to avoid warnings that y can be const
"}");
TODO_ASSERT_EQUALS("can be const", errout.str(), ""); //Currently taking the address is treated as a non-const operation when it should depend on what we do with it
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U const * y = dynamic_cast<U const *>(&x);\n"
" y->mutate();\n" // to avoid warnings that y can be const
"}");
TODO_ASSERT_EQUALS("can be const", errout.str(), ""); //Currently taking the address is treated as a non-const operation when it should depend on what we do with it
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U const * const * const * const y = dynamic_cast<const U const * const * const * const>(&x);\n"
" y->mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U const * const * const * const y = dynamic_cast<const U const * const * const * const>(&x);\n"
" y->mutate();\n" // to avoid warnings that y can be const
"}");
TODO_ASSERT_EQUALS("can be const", errout.str(), ""); //Currently taking the address is treated as a non-const operation when it should depend on what we do with it
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U const * const * * const y = dynamic_cast<const U const * const * * const>(&x);\n"
" y->mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" my::fancy<typename type const *> const * const * const y = dynamic_cast<my::fancy<typename type const *> const * const * const>(&x);\n"
" y->mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U& y = (const U&)(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U& y = (U&)(x);\n"
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" const U& y = (typename const U&)(x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as reference to const\n", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U& y = (typename U&)(x);\n"
" y.mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("", errout.str());
check("struct T : public U { void dostuff() const {}};\n"
"void a(T& x) {\n"
" x.dostuff();\n"
" U* y = (U*)(&x);\n"
" y->mutate();\n" // to avoid warnings that y can be const
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) C-style pointer casting\n", errout.str());
check("struct C { void f() const; };\n" // #9875 - crash
"\n"
"void foo(C& x) {\n"
" x.f();\n"
" foo( static_cast<U2>(0) );\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class a {\n"
" void foo(const int& i) const;\n"
" void operator()(int& i) const;\n"
"};\n"
"void f(int& i) {\n"
" a()(i);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("class a {\n"
" void operator()(const int& i) const;\n"
"};\n"
"void f(int& i) {\n"
" a()(i);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'i' can be declared as reference to const\n", errout.str());
// #9767
check("void fct1(MyClass& object) {\n"
" fct2([&](void){}, object);\n"
"}\n"
"bool fct2(std::function<void()> lambdaExpression, MyClass& object) {\n"
" object.modify();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #9778
check("struct A {};\n"
"struct B : A {};\n"
"B& f(A& x) {\n"
" return static_cast<B&>(x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #10002
check("using A = int*;\n"
"void f(const A& x) {\n"
" ++(*x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #10086
check("struct V {\n"
" V& get(typename std::vector<V>::size_type i) {\n"
" std::vector<V>& arr = v;\n"
" return arr[i];\n"
" }\n"
" std::vector<V> v;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("void e();\n"
"void g(void);\n"
"void h(void);\n"
"void ah(void);\n"
"void ai(void);\n"
"void j(void);\n"
"void e(void);\n"
"void k(void);\n"
"void l(void);\n"
"void m(void);\n"
"void n(void);\n"
"void o(void);\n"
"void q(void);\n"
"void r(void);\n"
"void t(void);\n"
"void u(void);\n"
"void v(void);\n"
"void w(void);\n"
"void z(void);\n"
"void aj(void);\n"
"void am(void);\n"
"void g(void);\n"
"void h(void);\n"
"void ah(void);\n"
"void an(void);\n"
"void e(void);\n"
"void k(void);\n"
"void ao(wchar_t *d);\n"
"void ah(void);\n"
"void e(void);\n"
"void an(void);\n"
"void e(void);\n"
"void k(void);\n"
"void g(void);\n"
"void ah(void);\n"
"void an(void);\n"
"void e(void);\n"
"void e(void);\n"
"void e(void);\n"
"void k(void);\n"
"void g(void);\n"
"void ah(void);\n"
"void an(void);\n"
"void e(void);\n"
"void e(void);\n"
"void k(void);\n"
"void g(void);\n"
"void h(void);\n"
"void ah(void);\n"
"void an(void);\n"
"void e(void);\n"
"void k(void);\n"
"void e(void);\n"
"void g(void);\n"
"void ah(void);\n"
"void k(void);\n"
"void an(void);\n"
"void e(void);\n"
"void e(void);\n"
"void e(void);\n"
"void k(void);\n"
"void g(void);\n"
"void h(void);\n"
"void ah(void);\n"
"void k(void);\n"
"void an(void);\n"
"void k(void);\n"
"void e(void);\n"
"void g(void);\n"
"void ah(void);\n"
"void e(void);\n"
"void k(void);\n"
"void g(void);\n"
"void h(void);\n"
"void ah(void);\n"
"void an(void);\n"
"void an(void);\n"
"void k(void);\n"
"void e(void);\n"
"void e(void);\n"
"void e(void);\n"
"void g(void);\n"
"void k(void);\n"
"void g(void);\n"
"void h(void);\n"
"void ah(void);\n"
"void an(void);\n"
"void k(void);\n"
"void k(void);\n"
"void e(void);\n"
"void g(void);\n"
"void g(void);\n"
"void ah(void);\n"
"void an(void);\n"
"void e(void);\n"
"void k(void);\n"
"void e(void);\n"
"void ap(wchar_t *c, int d);\n"
"void ah(void);\n"
"void an(void);\n"
"void g(void);\n"
"void h(void);\n"
"void ah(void);\n"
"void aq(char *b, size_t d, char *c, int a);\n"
"void ar(char *b, size_t d, char *c, va_list a);\n"
"void k(void);\n"
"void g(void);\n"
"void g(void);\n"
"void h(void);\n"
"void ah(void);\n"
"void an(void);\n"
"void k(void);\n"
"void k(void);\n"
"void e(void);\n"
"void g(void);\n"
"void g(void);\n"
"void as(std::string s);\n"
"void at(std::ifstream &f);\n"
"void au(std::istream &f);\n"
"void av(std::string &aa, std::wstring &ab);\n"
"void aw(bool b, double x, double y);\n"
"void ax(int i);\n"
"void ay(std::string c, std::wstring a);\n"
"void az(const std::locale &ac);\n"
"void an();\n"
"void ba(std::ifstream &f);\n"
"void bb(std::istream &f) {\n"
"f.read(NULL, 0);\n"
"}\n"
"void h(void) {\n"
"struct tm *tm = 0;\n"
"(void)std::asctime(tm);\n"
"(void)std::asctime(0);\n"
"}\n"
"void bc(size_t ae) {\n"
"wchar_t *ad = 0, *af = 0;\n"
"struct tm *ag = 0;\n"
"(void)std::wcsftime(ad, ae, af, ag);\n"
"(void)std::wcsftime(0, ae, 0, 0);\n"
"}\n"
"void k(void) {}\n"
"void bd(void);\n"
"void be(void);\n"
"void bf(int b);\n"
"void e(void);\n"
"void e(void);\n"
"void bg(wchar_t *p);\n"
"void bh(const std::list<int> &ak, const std::list<int> &al);\n"
"void ah();\n"
"void an();\n"
"void h();");
ASSERT_EQUALS("[test.cpp:131]: (style) Variable 'tm' can be declared as pointer to const\n"
"[test.cpp:136]: (style) Variable 'af' can be declared as pointer to const\n"
"[test.cpp:137]: (style) Variable 'ag' can be declared as pointer to const\n",
errout.str());
check("class C\n"
"{\n"
"public:\n"
" explicit C(int&);\n"
"};\n"
"\n"
"class D\n"
"{\n"
"public:\n"
" explicit D(int&);\n"
"\n"
"private:\n"
" C c;\n"
"};\n"
"\n"
"D::D(int& i)\n"
" : c(i)\n"
"{\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class C\n"
"{\n"
"public:\n"
" explicit C(int&);\n"
"};\n"
"\n"
"class D\n"
"{\n"
"public:\n"
" explicit D(int&) noexcept;\n"
"\n"
"private:\n"
" C c;\n"
"};\n"
"\n"
"D::D(int& i) noexcept\n"
" : c(i)\n"
"{}");
ASSERT_EQUALS("", errout.str());
check("class C\n"
"{\n"
"public:\n"
" explicit C(const int&);\n"
"};\n"
"\n"
"class D\n"
"{\n"
"public:\n"
" explicit D(int&);\n"
"\n"
"private:\n"
" C c;\n"
"};\n"
"\n"
"D::D(int& i)\n"
" : c(i)\n"
"{\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:16]: (style) Parameter 'i' can be declared as reference to const\n", "", errout.str());
check("class C\n"
"{\n"
"public:\n"
" explicit C(int);\n"
"};\n"
"\n"
"class D\n"
"{\n"
"public:\n"
" explicit D(int&);\n"
"\n"
"private:\n"
" C c;\n"
"};\n"
"\n"
"D::D(int& i)\n"
" : c(i)\n"
"{\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:16]: (style) Parameter 'i' can be declared as reference to const\n", "", errout.str());
check("class C\n"
"{\n"
"public:\n"
" explicit C(int, int);\n"
"};\n"
"\n"
"class D\n"
"{\n"
"public:\n"
" explicit D(int&);\n"
"\n"
"private:\n"
" C c;\n"
"};\n"
"\n"
"D::D(int& i)\n"
" : c(0, i)\n"
"{\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:16]: (style) Parameter 'i' can be declared as reference to const\n", "", errout.str());
check("void f(std::map<int, std::vector<int>> &map) {\n" // #10266
" for (auto &[slave, panels] : map)\n"
" panels.erase(it);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct S { void f(); int i; };\n"
"void call_f(S& s) { (s.*(&S::f))(); }\n");
ASSERT_EQUALS("", errout.str());
check("struct S { int a[1]; };\n"
"void f(S& s) { int* p = s.a; *p = 0; }\n");
ASSERT_EQUALS("", errout.str());
check("struct Foo {\n" // #9910
" int* p{};\n"
" int* get() { return p; }\n"
" const int* get() const { return p; }\n"
"};\n"
"struct Bar {\n"
" int j{};\n"
" void f(Foo& foo) const { int* q = foo.get(); *q = j; }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("struct S {\n" // #10679
" void g(long L, const C*& PC) const;\n"
" void g(long L, C*& PC);\n"
"};\n"
"void f(S& s) {\n"
" C* PC{};\n"
" s.g(0, PC);\n"
"};\n");
ASSERT_EQUALS("", errout.str());
// #10785
check("template <class T, class C>\n"
"struct d {\n"
" T& g(C& c, T C::*f) { return c.*f; }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::map<int, int>& m) {\n"
" std::cout << m[0] << std::endl;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<std::map<int, int>>& v) {\n" // #11607
" for (auto& m : v)\n"
" std::cout << m[0];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { int i; };\n" // #11473
"void f(std::vector<std::vector<S>>&m, int*& p) {\n"
" auto& a = m[0];\n"
" for (auto& s : a) {\n"
" p = &s.i;\n"
" return;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int& g(int* p, int& r) {\n" // #11625
" if (p)\n"
" return *p;\n"
" return r;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("template <typename T> void f(std::vector<T*>& d, const std::vector<T*>& s) {\n" // #11632
" for (const auto& e : s) {\n"
" T* newE = new T(*e);\n"
" d.push_back(newE);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::array<int, 2>& a) {\n"
" if (a[0]) {}\n"
"}\n"
"void g(std::array<int, 2>& a) {\n"
" a.fill(0);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'a' can be declared as const array\n", errout.str());
// #11682
check("struct b {\n"
" void mutate();\n"
"};\n"
"struct c {\n"
" const b& get() const;\n"
" b get();\n"
"};\n"
"struct d {\n"
" void f(c& e) const {\n"
" e.get().mutate();\n"
" }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("struct B { virtual void f() const {} };\n" // #11528
"struct D : B {};\n"
"void g(B* b) {\n"
" D* d = dynamic_cast<D*>(b);\n"
" if (d)\n"
" d->f();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Variable 'd' can be declared as pointer to const\n", errout.str());
check("void g(const int*);\n"
"void f(const std::vector<int*>&v) {\n"
" for (int* i : v)\n"
" g(i);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'i' can be declared as pointer to const\n", errout.str());
check("struct A {\n" // #11225
" A();\n"
" virtual ~A();\n"
"};\n"
"struct B : A {};\n"
"void f(A* a) {\n"
" const B* b = dynamic_cast<const B*>(a);\n"
"}\n"
"void g(A* a) {\n"
" const B* b = (const B*)a;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (style) C-style pointer casting\n"
"[test.cpp:6]: (style) Parameter 'a' can be declared as pointer to const\n"
"[test.cpp:9]: (style) Parameter 'a' can be declared as pointer to const\n",
errout.str());
check("void g(int*);\n"
"void f(std::vector<int>& v) {\n"
" g(v.data());\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(const int*);\n"
"void f(std::vector<int>& v) {\n"
" g(v.data());\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'v' can be declared as reference to const\n", errout.str());
check("struct a {\n"
" template <class T>\n"
" void mutate();\n"
"};\n"
"struct b {};\n"
"template <class T>\n"
"void f(a& x) {\n"
" x.mutate<T>();\n"
"}\n"
"template <class T>\n"
"void f(const b&)\n"
"{}\n"
"void g(a& c) { f<int>(c); }\n");
ASSERT_EQUALS("", errout.str());
check("struct S {\n"
" template <typename T>\n"
" T* g() {\n"
" return reinterpret_cast<T*>(m);\n"
" }\n"
" template <typename T>\n"
" const T* g() const {\n"
" return reinterpret_cast<const T*>(m);\n"
" }\n"
" char* m;\n"
"};\n"
"void f(S& s) {\n"
" const int* p = s.g<int>();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { int x; };\n" // #11818
"std::istream& f(std::istream& is, S& s) {\n"
" return is >> s.x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("bool f(std::string& s1, std::string& s2) {\n" // #12203
" return &s1 == &s2;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 's1' can be declared as reference to const\n"
"[test.cpp:1]: (style) Parameter 's2' can be declared as reference to const\n",
errout.str());
check("struct S {\n"
" void f(int& r) { p = &r; }\n"
" int* p;\n"
"};\n"
"void g(std::vector<int>& v1, std::vector<int*>& v2) {\n"
" std::transform(v1.begin(), v1.end(), v2.begin(), [](auto& x) { return &x; });\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void constParameterCallback() {
check("int callback(std::vector<int>& x) { return x[0]; }\n"
"void f() { dostuff(callback); }");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:1]: (style) Parameter 'x' can be declared as reference to const. However it seems that 'callback' is a callback function, if 'x' is declared with const you might also need to cast function pointer(s).\n", errout.str());
// #9906
check("class EventEngine : public IEventEngine {\n"
"public:\n"
" EventEngine();\n"
"\n"
"private:\n"
" void signalEvent(ev::sig& signal, int revents);\n"
"};\n"
"\n"
"EventEngine::EventEngine() {\n"
" mSigWatcher.set<EventEngine, &EventEngine::signalEvent>(this);\n"
"}\n"
"\n"
"void EventEngine::signalEvent(ev::sig& signal, int revents) {\n"
" switch (signal.signum) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:10] -> [test.cpp:13]: (style) Parameter 'signal' can be declared as reference to const. However it seems that 'signalEvent' is a callback function, if 'signal' is declared with const you might also need to cast function pointer(s).\n", errout.str());
}
void constPointer() {
check("void foo(int *p) { return *p; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { x = *p; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { int &ref = *p; ref = 12; }");
ASSERT_EQUALS("", errout.str());
check("void foo(int *p) { x = *p + 10; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { return p[10]; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { int &ref = p[0]; ref = 12; }");
ASSERT_EQUALS("", errout.str());
check("void foo(int *p) { x[*p] = 12; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { if (p) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { if (p || x) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { if (p == 0) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { if (!p) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { if (*p > 123) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { return *p + 1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(int *p) { return *p > 1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void foo(const int* c) { if (c == 0) {}; }");
ASSERT_EQUALS("", errout.str());
check("struct a { void b(); };\n"
"struct c {\n"
" a* d;\n"
" a& g() { return *d; }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("struct a { void b(); };\n"
"struct c { a* d; };\n"
"void e(c);\n");
ASSERT_EQUALS("", errout.str());
check("struct V {\n"
" V& get(typename std::vector<V>::size_type i, std::vector<V>* arr) {\n"
" return arr->at(i);\n"
" }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("struct A {};\n"
"struct B : A {};\n"
"B* f(A* x) {\n"
" return static_cast<B*>(x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f(std::vector<int>* x) {\n"
" int& i = (*x)[0];\n"
" i++;\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A { int a; };\n"
"A f(std::vector<A>* x) {\n"
" x->front().a = 1;\n"
" return x->front();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int>* v) {\n"
" for(auto&& x:*v)\n"
" x = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" int* x;\n"
" A(int* y) : x(y)\n"
" {}\n"
"};");
ASSERT_EQUALS("", errout.str());
check("void f(bool b, int* x, int* y) {\n"
" int* z = x;\n"
" int* w = b ? y : z;\n"
" *w = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(bool b, int* x, int* y) {\n"
" int& z = *x;\n"
" int& w = b ? *y : z;\n"
" w = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class Base { virtual void dostuff(int *p) = 0; };\n" // #10397
"class Derived: public Base { int x; void dostuff(int *p) override { x = *p; } };");
ASSERT_EQUALS("", errout.str());
check("struct Data { char buf[128]; };\n" // #10483
"void encrypt(Data& data) {\n"
" const char a[] = \"asfasd\";\n"
" memcpy(data.buf, &a, sizeof(a));\n"
"}");
ASSERT_EQUALS("", errout.str());
// #10547
check("void foo(std::istream &istr) {\n"
" unsigned char x[2];\n"
" istr >> x[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
// #10744
check("S& f() {\n"
" static S* p = new S();\n"
" return *p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" static int i[1] = {};\n"
" return i[0];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'i' can be declared as const array\n", errout.str());
check("int f() {\n"
" static int i[] = { 0 };\n"
" int j = i[0] + 1;\n"
" return j;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'i' can be declared as const array\n", errout.str());
// #10471
check("void f(std::array<int, 1> const& i) {\n"
" if (i[0] == 0) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #10466
check("typedef void* HWND;\n"
"void f(const std::vector<HWND>&v) {\n"
" for (const auto* h : v)\n"
" if (h) {}\n"
" for (const auto& h : v)\n"
" if (h) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'h' can be declared as pointer to const\n", errout.str());
check("void f(const std::vector<int*>& v) {\n"
" for (const auto& p : v)\n"
" if (p == nullptr) {}\n"
" for (const auto* p : v)\n"
" if (p == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'p' can be declared as pointer to const\n", errout.str());
check("void f(std::vector<int*>& v) {\n"
" for (const auto& p : v)\n"
" if (p == nullptr) {}\n"
" for (const auto* p : v)\n"
" if (p == nullptr) {}\n"
" for (const int* const& p : v)\n"
" if (p == nullptr) {}\n"
" for (const int* p : v)\n"
" if (p == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'v' can be declared as reference to const\n"
"[test.cpp:2]: (style) Variable 'p' can be declared as pointer to const\n",
errout.str());
check("void f(std::vector<const int*>& v) {\n"
" for (const auto& p : v)\n"
" if (p == nullptr) {}\n"
" for (const auto* p : v)\n"
" if (p == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'v' can be declared as reference to const\n", errout.str());
check("void f(const std::vector<const int*>& v) {\n"
" for (const auto& p : v)\n"
" if (p == nullptr) {}\n"
" for (const auto* p : v)\n"
" if (p == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(const int* const p) {\n"
" if (p == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(int*);\n"
"void f(int* const* pp) {\n"
" int* p = pp[0];\n"
" g(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("template <typename T>\n"
"struct S {\n"
" static bool f(const T& t) { return t != nullptr; }\n"
"};\n"
"S<int*> s;\n");
ASSERT_EQUALS("", errout.str());
check("void f(int i) {\n"
" const char *tmp;\n"
" char* a[] = { \"a\", \"aa\" };\n"
" static char* b[] = { \"b\", \"bb\" };\n"
" tmp = a[i];\n"
" printf(\"%s\", tmp);\n"
" tmp = b[i];\n"
" printf(\"%s\", tmp);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'a' can be declared as const array\n"
"[test.cpp:4]: (style) Variable 'b' can be declared as const array\n",
errout.str());
check("typedef void* HWND;\n" // #11084
"void f(const HWND h) {\n"
" if (h == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("using HWND = void*;\n"
"void f(const HWND h) {\n"
" if (h == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("typedef int A;\n"
"void f(A* x) {\n"
" if (x == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as pointer to const\n", errout.str());
check("using A = int;\n"
"void f(A* x) {\n"
" if (x == nullptr) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'x' can be declared as pointer to const\n", errout.str());
check("struct S { void v(); };\n" // #11095
"void f(S* s) {\n"
" (s - 1)->v();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int*>& v) {\n" // #11085
" for (int* p : v) {\n"
" if (p) {}\n"
" }\n"
" for (auto* p : v) {\n"
" if (p) {}\n"
" }\n"
" v.clear();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'p' can be declared as pointer to const\n"
"[test.cpp:5]: (style) Variable 'p' can be declared as pointer to const\n",
errout.str());
check("void f() {\n"
" char a[1][1];\n"
" char* b[1];\n"
" b[0] = a[0];\n"
" **b = 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("ptrdiff_t f(int *p0, int *p1) {\n" // #11148
" return p0 - p1;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p0' can be declared as pointer to const\n"
"[test.cpp:1]: (style) Parameter 'p1' can be declared as pointer to const\n",
errout.str());
check("void f() {\n"
" std::array<int, 1> a{}, b{};\n"
" const std::array<int, 1>& r = a;\n"
" if (r == b) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S {};\n" // #11599
"void g(S);\n"
"void h(const S&);\n"
"void h(int, int, const S&);\n"
"void i(S&);\n"
"void j(const S*);\n"
"void j(int, int, const S*);\n"
"void f1(S* s) {\n"
" g(*s);\n"
"}\n"
"void f2(S* s) {\n"
" h(*s);\n"
"}\n"
"void f3(S* s) {\n"
" h(1, 2, *s);\n"
"}\n"
"void f4(S* s) {\n"
" i(*s);\n"
"}\n"
"void f5(S& s) {\n"
" j(&s);\n"
"}\n"
"void f6(S& s) {\n"
" j(1, 2, &s);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:20]: (style) Parameter 's' can be declared as reference to const\n"
"[test.cpp:23]: (style) Parameter 's' can be declared as reference to const\n"
"[test.cpp:8]: (style) Parameter 's' can be declared as pointer to const\n"
"[test.cpp:11]: (style) Parameter 's' can be declared as pointer to const\n"
"[test.cpp:14]: (style) Parameter 's' can be declared as pointer to const\n",
errout.str());
check("void g(int, const int*);\n"
"void h(const int*);\n"
"void f(int* p) {\n"
" g(1, p);\n"
" h(p);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Parameter 'p' can be declared as pointer to const\n",
errout.str());
check("void f(int, const int*);\n"
"void f(int i, int* p) {\n"
" f(i, const_cast<const int*>(p));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { int a; };\n"
"void f(std::vector<S>& v, int b) {\n"
" size_t n = v.size();\n"
" for (size_t i = 0; i < n; i++) {\n"
" S& s = v[i];\n"
" if (!(b & s.a))\n"
" continue;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Variable 's' can be declared as reference to const\n", errout.str()); // don't crash
check("void f(int& i) {\n"
" new (&i) int();\n"
"}\n");
ASSERT_EQUALS("", errout.str()); // don't crash
check("void f(int& i) {\n"
" int& r = i;\n"
" if (!&r) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'r' can be declared as reference to const\n", errout.str()); // don't crash
check("class C;\n" // #11646
"void g(const C* const p);\n"
"void f(C* c) {\n"
" g(c);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Parameter 'c' can be declared as pointer to const\n", errout.str());
check("typedef void (*cb_t)(int*);\n" // #11674
"void cb(int* p) {\n"
" if (*p) {}\n"
"}\n"
"void g(cb_t);\n"
"void f() {\n"
" g(cb);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:2]: (style) Parameter 'p' can be declared as pointer to const. "
"However it seems that 'cb' is a callback function, if 'p' is declared with const you might also need to cast function pointer(s).\n",
errout.str());
check("typedef void (*cb_t)(int*);\n"
"void cb(int* p) {\n"
" if (*p) {}\n"
"}\n"
"void g(cb_t);\n"
"void f() {\n"
" g(::cb);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:2]: (style) Parameter 'p' can be declared as pointer to const. "
"However it seems that 'cb' is a callback function, if 'p' is declared with const you might also need to cast function pointer(s).\n",
errout.str());
check("void f1(std::vector<int>* p) {\n" // #11681
" if (p->empty()) {}\n" // warn
"}\n"
"void f2(std::vector<int>* p) {\n"
" p->resize(0);\n"
"}\n"
"struct S {\n"
" void h1() const;\n"
" void h2();\n"
" int i;\n"
"};\n"
"void k(int&);\n"
"void g1(S* s) {\n"
" s->h1();\n" // warn
"}\n"
"void g1(S* s) {\n"
" s->h2();\n"
"}\n"
"void g1(S* s) {\n"
" if (s->i) {}\n" // warn
"}\n"
"void g2(S* s) {\n"
" s->i = 0;\n"
"}\n"
"void g3(S* s) {\n"
" k(s->i);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n"
"[test.cpp:13]: (style) Parameter 's' can be declared as pointer to const\n"
"[test.cpp:19]: (style) Parameter 's' can be declared as pointer to const\n",
errout.str());
check("struct S {\n" // #11573
" const char* g() const {\n"
" return m;\n"
" }\n"
" const char* m;\n"
"};\n"
"struct T { std::vector<S*> v; };\n"
"void f(T* t, const char* n) {\n"
" for (const auto* p : t->v)\n"
" if (strcmp(p->g(), n) == 0) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (style) Parameter 't' can be declared as pointer to const\n",
errout.str());
check("void f(int*& p, int* q) {\n"
" p = q;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { int a[1]; };\n"
"void f(S* s) {\n"
" if (s->a[0]) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 's' can be declared as pointer to const\n",
errout.str());
check("size_t f(char* p) {\n" // #11842
" return strlen(p);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n", errout.str());
check("void f(int* p) {\n" // #11862
" long long j = *(p++);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'p' can be declared as pointer to const\n",
errout.str());
check("void f(void *p, size_t nmemb, size_t size, int (*cmp)(const void *, const void *)) {\n"
" qsort(p, nmemb, size, cmp);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(bool *r, std::size_t *b) {\n" // #12129
" if (*r && *b >= 5) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'r' can be declared as pointer to const\n"
"[test.cpp:1]: (style) Parameter 'b' can be declared as pointer to const\n",
errout.str());
check("void f(int i) {\n" // #12185
" void* p = &i;\n"
" std::cout << p << '\\n';\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'p' can be declared as pointer to const\n",
errout.str());
}
void switchRedundantAssignmentTest() {
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:9]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y = 2;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:11]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" if (x)\n"
" {\n"
" y = 3;\n"
" }\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y = 2;\n"
" if (z)\n"
" printf(\"%d\", y);\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int x = a;\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" x = 2;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" break;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" continue;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" throw e;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" printf(\"%d\", y);\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" bar();\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:10]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void bar() {}\n" // bar isn't noreturn
"void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" bar();\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:11]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo(int a) {\n"
" char str[10];\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" strcpy(str, \"a'\");\n"
" case 3:\n"
" strcpy(str, \"b'\");\n"
" }\n"
"}", nullptr, false, false);
TODO_ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:8]: (style) Buffer 'str' is being written before its old content has been used. 'break;' missing?\n",
"",
errout.str());
check("void foo(int a) {\n"
" char str[10];\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" strncpy(str, \"a'\");\n"
" case 3:\n"
" strncpy(str, \"b'\");\n"
" }\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:8]: (style) Buffer 'str' is being written before its old content has been used. 'break;' missing?\n",
"",
errout.str());
check("void foo(int a) {\n"
" char str[10];\n"
" int z = 0;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" strcpy(str, \"a'\");\n"
" z++;\n"
" case 3:\n"
" strcpy(str, \"b'\");\n"
" z++;\n"
" }\n"
"}", nullptr, false, false);
TODO_ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:10]: (style) Buffer 'str' is being written before its old content has been used. 'break;' missing?\n",
"",
errout.str());
check("void foo(int a) {\n"
" char str[10];\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" strcpy(str, \"a'\");\n"
" break;\n"
" case 3:\n"
" strcpy(str, \"b'\");\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a) {\n"
" char str[10];\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" strcpy(str, \"a'\");\n"
" printf(str);\n"
" case 3:\n"
" strcpy(str, \"b'\");\n"
" }\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
// Ticket #5158 "segmentation fault (valid code)"
check("typedef struct ct_data_s {\n"
" union {\n"
" char freq;\n"
" } fc;\n"
"} ct_data;\n"
"typedef struct internal_state {\n"
" struct ct_data_s dyn_ltree[10];\n"
"} deflate_state;\n"
"void f(deflate_state *s) {\n"
" s->dyn_ltree[0].fc.freq++;\n"
"}\n", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
// Ticket #6132 "crash: daca: kvirc CheckOther::checkRedundantAssignment()"
check("void HttpFileTransfer :: transferTerminated ( bool bSuccess@1 ) {\n"
"if ( m_szCompletionCallback . isNull ( ) ) {\n"
"KVS_TRIGGER_EVENT ( KviEvent_OnHTTPGetTerminated , out ? out : ( g_pApp . activeConsole ( ) ) , & vParams )\n"
"} else {\n"
"KviKvsScript :: run ( m_szCompletionCallback , out ? out : ( g_pApp . activeConsole ( ) ) , & vParams ) ;\n"
"}\n"
"}\n", nullptr, false, true);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int x;\n"
" switch (state) {\n"
" case 1: x = 3; goto a;\n"
" case 1: x = 6; goto a;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void switchRedundantOperationTest() {
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" ++y;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:9]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" ++y;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:11]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" (void)y;\n"
" case 3:\n"
" ++y;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" ++y;\n"
" case 3:\n"
" ++y;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" --y;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:9]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" --y;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:11]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" (void)y;\n"
" case 3:\n"
" --y;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" --y;\n"
" case 3:\n"
" --y;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y++;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:9]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y++;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:11]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" y++;\n"
" }\n"
" bar(y);\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y++;\n"
" case 3:\n"
" y++;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y--;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:9]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y--;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:11]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" y--;\n"
" }\n"
" bar(y);\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y--;\n"
" case 3:\n"
" y--;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y++;\n"
" case 3:\n"
" if (x)\n"
" {\n"
" y = 3;\n"
" }\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y++;\n"
" if (y)\n"
" printf(\"%d\", y);\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int x = a;\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" x++;\n"
" case 3:\n"
" y++;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y++;\n"
" break;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y++;\n"
" continue;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y++;\n"
" throw e;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y++;\n"
" printf(\"%d\", y);\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y++;\n"
" bar();\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:10]: (style) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("bool f() {\n"
" bool ret = false;\n"
" switch (switchCond) {\n"
" case 1:\n"
" ret = true;\n"
" break;\n"
" case 31:\n"
" ret = true;\n"
" break;\n"
" case 54:\n"
" ret = true;\n"
" break;\n"
" };\n"
" ret = true;\n"
" return ret;\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:14]: (style) Variable 'ret' is reassigned a value before the old one has been used.\n"
"[test.cpp:8] -> [test.cpp:14]: (style) Variable 'ret' is reassigned a value before the old one has been used.\n"
"[test.cpp:11] -> [test.cpp:14]: (style) Variable 'ret' is reassigned a value before the old one has been used.\n",
errout.str());
}
void switchRedundantBitwiseOperationTest() {
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= 3;\n"
" case 3:\n"
" y |= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Redundant bitwise operation on 'y' in 'switch' statement. 'break;' missing?\n", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = y | 3;\n"
" case 3:\n"
" y = y | 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Redundant bitwise operation on 'y' in 'switch' statement. 'break;' missing?\n", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= 3;\n"
" default:\n"
" y |= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Redundant bitwise operation on 'y' in 'switch' statement. 'break;' missing?\n", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= 3;\n"
" default:\n"
" if (z)\n"
" y |= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= z;\n"
" z++\n"
" default:\n"
" y |= z;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= 3;\n"
" bar(y);\n"
" case 3:\n"
" y |= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= 3;\n"
" y = 4;\n"
" case 3:\n"
" y |= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:8]: (style) Variable 'y' is reassigned a value before the old one has been used.\n", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y &= 3;\n"
" case 3:\n"
" y &= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Redundant bitwise operation on 'y' in 'switch' statement. 'break;' missing?\n", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= 3;\n"
" break;\n"
" case 3:\n"
" y |= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y ^= 3;\n"
" case 3:\n"
" y ^= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= 2;\n"
" case 3:\n"
" y |= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y &= 2;\n"
" case 3:\n"
" y &= 3;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y |= 2;\n"
" case 3:\n"
" y &= 2;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void unreachableCode() {
check("void foo(int a) {\n"
" while(1) {\n"
" if (a++ >= 100) {\n"
" break;\n"
" continue;\n"
" }\n"
" }\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:5]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("int foo(int a) {\n"
" return 0;\n"
" return(a-1);\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("int foo(int a) {\n"
" A:"
" return(0);\n"
" goto A;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
constexpr char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <function name=\"exit\">\n"
" <noreturn>true</noreturn>\n"
" <arg nr=\"1\"/>\n"
" </function>\n"
"</def>";
Settings settings = settingsBuilder().libraryxml(xmldata, sizeof(xmldata)).build();
check("void foo() {\n"
" exit(0);\n"
" break;\n"
"}", nullptr, false, false, false, &settings);
ASSERT_EQUALS("[test.cpp:3]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("class NeonSession {\n"
" void exit();\n"
"};\n"
"void NeonSession::exit()\n"
"{\n"
" SAL_INFO(\"ucb.ucp.webdav\", \"neon commands cannot be aborted\");\n"
"}", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
check("void NeonSession::exit()\n"
"{\n"
" SAL_INFO(\"ucb.ucp.webdav\", \"neon commands cannot be aborted\");\n"
"}", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
check("void foo() { xResAccess->exit(); }", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" switch(a) {\n"
" case 0:\n"
" printf(\"case 0\");\n"
" break;\n"
" break;\n"
" case 1:\n"
" c++;\n"
" break;\n"
" }\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:7]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("void foo(int a)\n"
"{\n"
" switch(a) {\n"
" case 0:\n"
" printf(\"case 0\");\n"
" break;\n"
" case 1:\n"
" c++;\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" while(true) {\n"
" if (a++ >= 100) {\n"
" break;\n"
" break;\n"
" }\n"
" }\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:6]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("void foo(int a)\n"
"{\n"
" while(true) {\n"
" if (a++ >= 100) {\n"
" continue;\n"
" continue;\n"
" }\n"
" a+=2;\n"
" }\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:6]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("void foo(int a)\n"
"{\n"
" while(true) {\n"
" if (a++ >= 100) {\n"
" continue;\n"
" }\n"
" a+=2;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
" throw 0;\n"
" return 1;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("void foo() {\n"
" throw 0;\n"
" return;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("int foo() {\n"
" throw = 0;\n"
" return 1;\n"
"}", "test.c", false, false);
ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
" return 0;\n"
" return 1;\n"
"}", nullptr, false, false, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("int foo() {\n"
" return 0;\n"
" foo();\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Statements following 'return' will never be executed.\n", errout.str());
check("int foo(int unused) {\n"
" return 0;\n"
" (void)unused;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("int foo(int unused1, int unused2) {\n"
" return 0;\n"
" (void)unused1;\n"
" (void)unused2;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("int foo(int unused1, int unused2) {\n"
" return 0;\n"
" (void)unused1;\n"
" (void)unused2;\n"
" foo();\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:5]: (style) Statements following 'return' will never be executed.\n", errout.str());
check("int foo() {\n"
" if(bar)\n"
" return 0;\n"
" return 124;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
" while(bar) {\n"
" return 0;\n"
" return 0;\n"
" return 0;\n"
" return 0;\n"
" }\n"
" return 124;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:4]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("void foo() {\n"
" while(bar) {\n"
" return;\n"
" break;\n"
" }\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:4]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
// #5707
check("extern int i,j;\n"
"int foo() {\n"
" switch(i) {\n"
" default: j=1; break;\n"
" }\n"
" return 0;\n"
" j=2;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:7]: (style) Statements following 'return' will never be executed.\n", errout.str());
check("int foo() {\n"
" return 0;\n"
" label:\n"
" throw 0;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Label 'label' is not used.\n", errout.str());
check("struct A {\n"
" virtual void foo (P & Val) throw ();\n"
" virtual void foo1 (P & Val) throw ();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
" goto label;\n"
" while (true) {\n"
" bar();\n"
" label:\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str()); // #3457
check("int foo() {\n"
" goto label;\n"
" do {\n"
" bar();\n"
" label:\n"
" } while (true);\n"
"}");
ASSERT_EQUALS("", errout.str()); // #3457
check("int foo() {\n"
" goto label;\n"
" for (;;) {\n"
" bar();\n"
" label:\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str()); // #3457
// #3383. TODO: Use preprocessor
check("int foo() {\n"
"\n" // #ifdef A
" return 0;\n"
"\n" // #endif
" return 1;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
"\n" // #ifdef A
" return 0;\n"
"\n" // #endif
" return 1;\n"
"}", nullptr, true, false);
ASSERT_EQUALS("[test.cpp:5]: (style, inconclusive) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
// #4711 lambda functions
check("int f() {\n"
" return g([](int x){(void)x+1; return x;});\n"
"}",
nullptr,
false,
false);
ASSERT_EQUALS("", errout.str());
// #4756
check("template <>\n"
"inline uint16_t htobe(uint16_t value) {\n"
" return ( __extension__ ({\n"
" register unsigned short int __v, __x = (unsigned short int) (value);\n"
" if (__builtin_constant_p (__x))\n"
" __v = ((unsigned short int) ((((__x) >> 8) & 0xff) | (((__x) & 0xff) << 8)));\n"
" else\n"
" __asm__ (\"rorw $8, %w0\" : \"=r\" (__v) : \"0\" (__x) : \"cc\");\n"
" (void)__v;\n"
" }));\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
// #6008
check("static std::function< int ( int, int ) > GetFunctor() {\n"
" return [](int a_, int b_) -> int {\n"
" int sum = a_ + b_;\n"
" return sum;\n"
" };\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
// #5789
check("struct per_state_info {\n"
" uint64_t enter, exit;\n"
" uint64_t events;\n"
" per_state_info() : enter(0), exit(0), events(0) {}\n"
"};", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
// #6664
check("void foo() {\n"
" (beat < 100) ? (void)0 : exit(0);\n"
" bar();\n"
"}", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" (beat < 100) ? exit(0) : (void)0;\n"
" bar();\n"
"}", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
// #8261
// TODO Do not throw AST validation exception
TODO_ASSERT_THROW(check("void foo() {\n"
" (beat < 100) ? (void)0 : throw(0);\n"
" bar();\n"
"}", nullptr, false, false, false, &settings), InternalError);
//ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
" exit(0);\n"
" return 1;\n" // <- clarify for tools that function does not continue..
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" enum : uint8_t { A, B } var = A;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkP("#define INB(x) __extension__ ({ u_int tmp = (x); inb(tmp); })\n" // #4739
"static unsigned char cmos_hal_read(unsigned index) {\n"
" unsigned short port_0, port_1;\n"
" assert(!verify_cmos_byte_index(index));\n"
" if (index < 128) {\n"
" port_0 = 0x70;\n"
" port_1 = 0x71;\n"
" }\n"
" else {\n"
" port_0 = 0x72;\n"
" port_1 = 0x73;\n"
" }\n"
" OUTB(index, port_0);\n"
" return INB(port_1);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
check("[[noreturn]] void n();\n"
"void f() {\n"
" n();\n"
" g();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Statements following noreturn function 'n()' will never be executed.\n", errout.str());
check("void f() {\n"
" exit(1);\n"
" g();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Statements following noreturn function 'exit()' will never be executed.\n", errout.str());
check("void f() {\n"
" do {\n"
" break;\n"
" g();\n"
" } while (0);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Statements following 'break' will never be executed.\n", errout.str());
}
void redundantContinue() {
check("void f() {\n" // #11195
" for (int i = 0; i < 10; ++i) {\n"
" printf(\"i = %d\\n\", i);\n"
" continue;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) 'continue' is redundant since it is the last statement in a loop.\n", errout.str());
check("void f() {\n"
" int i = 0;"
" do {\n"
" ++i;\n"
" printf(\"i = %d\\n\", i);\n"
" continue;\n"
" } while (i < 10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) 'continue' is redundant since it is the last statement in a loop.\n", errout.str());
}
void suspiciousCase() {
check("void foo() {\n"
" switch(a) {\n"
" case A&&B:\n"
" foo();\n"
" case (A||B):\n"
" foo();\n"
" case A||B:\n"
" foo();\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Found suspicious case label in switch(). Operator '&&' probably doesn't work as intended.\n"
"[test.cpp:5]: (warning, inconclusive) Found suspicious case label in switch(). Operator '||' probably doesn't work as intended.\n"
"[test.cpp:7]: (warning, inconclusive) Found suspicious case label in switch(). Operator '||' probably doesn't work as intended.\n", errout.str());
check("void foo() {\n"
" switch(a) {\n"
" case 1:\n"
" a=A&&B;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// TODO Do not throw AST validation exception
TODO_ASSERT_THROW(check("void foo() {\n"
" switch(a) {\n"
" case A&&B?B:A:\n"
" foo();\n"
" }\n"
"}"), InternalError);
//ASSERT_EQUALS("", errout.str());
}
void suspiciousEqualityComparison() {
check("void foo(int c) {\n"
" if (x) c == 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(const int* c) {\n"
" if (x) *c == 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(int c) {\n"
" if (c == 1) {\n"
" c = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int c) {\n"
" c == 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(int c) {\n"
" for (int i = 0; i == 10; i ++) {\n"
" a ++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int c) {\n"
" for (i == 0; i < 10; i ++) {\n"
" c ++;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(int c) {\n"
" for (i == 1; i < 10; i ++) {\n"
" c ++;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(int c) {\n"
" for (i == 2; i < 10; i ++) {\n"
" c ++;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(int c) {\n"
" for (int i = 0; i < 10; i == c) {\n"
" c ++;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(int c) {\n"
" for (; running == 1;) {\n"
" c ++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int c) {\n"
" printf(\"%i\", ({x==0;}));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int arg) {\n"
" printf(\"%i\", ({int x = do_something(); x == 0;}));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int x) {\n"
" printf(\"%i\", ({x == 0; x > 0 ? 10 : 20}));\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious equality comparison. Did you intend to assign a value instead?\n", errout.str());
check("void foo(int x) {\n"
" for (const Token* end = tok->link(); tok != end; tok = (tok == end) ? end : tok->next()) {\n"
" x++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int x) {\n"
" for (int i = (x == 0) ? 0 : 5; i < 10; i ++) {\n"
" x++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int x) {\n"
" for (int i = 0; i < 10; i += (x == 5) ? 1 : 2) {\n"
" x++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void suspiciousUnaryPlusMinus() { // #8004
check("int g() { return 1; }\n"
"void f() {\n"
" +g();\n"
" -g();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Found suspicious operator '+', result is not used.\n"
"[test.cpp:4]: (warning, inconclusive) Found suspicious operator '-', result is not used.\n",
errout.str());
check("void f(int i) {\n"
" +i;\n"
" -i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious operator '+', result is not used.\n"
"[test.cpp:3]: (warning, inconclusive) Found suspicious operator '-', result is not used.\n",
errout.str());
}
void selfAssignment() {
check("void foo()\n"
"{\n"
" int x = 1;\n"
" x = x;\n"
" return 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Redundant assignment of 'x' to itself.\n", errout.str());
check("void foo()\n"
"{\n"
" int x = x;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of 'x' to itself.\n", errout.str());
check("struct A { int b; };\n"
"void foo(A* a1, A* a2) {\n"
" a1->b = a1->b;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of 'a1->b' to itself.\n", errout.str());
check("int x;\n"
"void f()\n"
"{\n"
" x = x = 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Redundant assignment of 'x' to itself.\n", errout.str());
// #4073 (segmentation fault)
check("void Foo::myFunc( int a )\n"
"{\n"
" if (a == 42)\n"
" a = a;\n"
"}");
check("void foo()\n"
"{\n"
" int x = 1;\n"
" x = x + 1;\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int *x = getx();\n"
" *x = x;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" BAR *x = getx();\n"
" x = x;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of 'x' to itself.\n", errout.str());
// #2502 - non-primitive type -> there might be some side effects
check("void foo()\n"
"{\n"
" Fred fred; fred = fred;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" x = (x == 0);"
" func(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" x = (x != 0);"
" func(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
// ticket #3001 - false positive
check("void foo(int x) {\n"
" x = x ? x : 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3800 - false negative when variable is extern
check("extern int i;\n"
"void f() {\n"
" i = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of 'i' to itself.\n", errout.str());
// #4291 - id for variables accessed through 'this'
check("class Foo {\n"
" int var;\n"
" void func();\n"
"};\n"
"void Foo::func() {\n"
" this->var = var;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (warning) Redundant assignment of 'this->var' to itself.\n", errout.str());
check("class Foo {\n"
" int var;\n"
" void func(int var);\n"
"};\n"
"void Foo::func(int var) {\n"
" this->var = var;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #6406 - designated initializer doing bogus self assignment
check("struct callbacks {\n"
" void (*s)(void);\n"
"};\n"
"void something(void) {}\n"
"void f() {\n"
" struct callbacks ops = { .s = ops.s };\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:6]: (warning) Redundant assignment of 'something' to itself.\n", "", errout.str());
check("class V\n"
"{\n"
"public:\n"
" V()\n"
" {\n"
" x = y = z = 0.0;\n"
" }\n"
" V( double x, const double y_, const double &z_)\n"
" {\n"
" x = x; y = y; z = z;\n"
" }\n"
" double x, y, z;\n"
"};");
ASSERT_EQUALS("[test.cpp:10]: (warning) Redundant assignment of 'x' to itself.\n"
"[test.cpp:10]: (warning) Redundant assignment of 'y' to itself.\n"
"[test.cpp:10]: (warning) Redundant assignment of 'z' to itself.\n", errout.str());
check("void f(int i) { i = !!i; }");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" int x = 1;\n"
" int &ref = x;\n"
" ref = x;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (warning) Redundant assignment of 'ref' to itself.\n", errout.str());
check("class Foo {\n" // #9850
" int i{};\n"
" void modify();\n"
" void method() {\n"
" Foo copy = *this;\n"
" modify();\n"
" *this = copy;\n"
" }\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("struct S {\n" // #11383
" void f() {\n"
" int x = 42;"
" auto l2 = [i = i, x, y = 0]() { return i + x + y; };\n"
" }\n"
" int i;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #10337
" int b[2] = { 1, 2 };\n"
" int idx = 0;\n"
" int& i = b[idx];\n"
" idx++;\n"
" i = b[idx];\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void trac1132() {
check("class Lock\n"
"{\n"
"public:\n"
" Lock(int i)\n"
" {\n"
" std::cout << \"Lock \" << i << std::endl;\n"
" }\n"
" ~Lock()\n"
" {\n"
" std::cout << \"~Lock\" << std::endl;\n"
" }\n"
"};\n"
"int main()\n"
"{\n"
" Lock(123);\n"
" std::cout << \"hello\" << std::endl;\n"
" return 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:15]: (style) Instance of 'Lock' object is destroyed immediately.\n", errout.str());
}
void trac3693() {
check("struct A{\n"
" enum {\n"
" b = 300\n"
" };\n"
"};\n"
"const int DFLT_TIMEOUT = A::b % 1000000 ;\n", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunction1() {
check("int main ( )\n"
"{\n"
" CouldBeFunction ( 123 ) ;\n"
" return 0 ;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunction2() {
check("struct error {\n"
" error() {}\n"
"};\n"
"\n"
"class parser {\n"
"public:\n"
" void error() const {}\n"
"\n"
" void foo() const {\n"
" error();\n"
" do_something();\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectPicksClass() {
check("class NotAFunction ;\n"
"int function ( )\n"
"{\n"
" NotAFunction ( 123 );\n"
" return 0 ;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Instance of 'NotAFunction' object is destroyed immediately.\n", errout.str());
}
void testMisusedScopeObjectPicksStruct() {
check("struct NotAClass;\n"
"bool func ( )\n"
"{\n"
" NotAClass ( 123 ) ;\n"
" return true ;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Instance of 'NotAClass' object is destroyed immediately.\n", errout.str());
}
void testMisusedScopeObjectDoesNotPickIf() {
check("bool func( int a , int b , int c )\n"
"{\n"
" if ( a > b ) return c == a ;\n"
" return b == a ;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickConstructorDeclaration() {
check("class Something : public SomethingElse\n"
"{\n"
"public:\n"
"~Something ( ) ;\n"
"Something ( ) ;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunctor() {
check("class IncrementFunctor\n"
"{\n"
"public:\n"
" void operator()(int &i)\n"
" {\n"
" ++i;\n"
" }\n"
"};\n"
"\n"
"int main()\n"
"{\n"
" int a = 1;\n"
" IncrementFunctor()(a);\n"
" return a;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickLocalClassConstructors() {
check("void f() {\n"
" class Foo {\n"
" Foo() { }\n"
" Foo(int a) { }\n"
" Foo(int a, int b) { }\n"
" };\n"
" Foo();\n"
" do_something();\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Instance of 'Foo' object is destroyed immediately.\n", errout.str());
}
void testMisusedScopeObjectDoesNotPickUsedObject() {
check("struct Foo {\n"
" void bar() {\n"
" }\n"
"};\n"
"\n"
"void fn() {\n"
" Foo().bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickPureC() {
// Ticket #2352
const char code[] = "struct cb_watch_bool {\n"
" int a;\n"
"};\n"
"\n"
"void f()\n"
"{\n"
" cb_watch_bool();\n"
" do_something();\n"
"}\n";
check(code, "test.cpp");
ASSERT_EQUALS("[test.cpp:7]: (style) Instance of 'cb_watch_bool' object is destroyed immediately.\n", errout.str());
check(code, "test.c");
ASSERT_EQUALS("", errout.str());
// Ticket #2639
check("struct stat { int a; int b; };\n"
"void stat(const char *fn, struct stat *);\n"
"\n"
"void foo() {\n"
" stat(\"file.txt\", &st);\n"
" do_something();\n"
"}");
ASSERT_EQUALS("",errout.str());
check("struct AMethodObject {\n" // #4336
" AMethodObject(double, double, double);\n"
"};\n"
"struct S {\n"
" static void A(double, double, double);\n"
"};\n"
"void S::A(double const a1, double const a2, double const a3) {\n"
" AMethodObject(a1, a2, a3);\n"
"}\n");
ASSERT_EQUALS("",errout.str());
}
void testMisusedScopeObjectDoesNotPickNestedClass() {
const char code[] = "class ios_base {\n"
"public:\n"
" class Init {\n"
" public:\n"
" };\n"
"};\n"
"class foo {\n"
"public:\n"
" foo();\n"
" void Init(int);\n"
"};\n"
"foo::foo() {\n"
" Init(0);\n"
" do_something();\n"
"}\n";
check(code, "test.cpp");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectInConstructor() {
const char code[] = "class Foo {\n"
"public:\n"
" Foo(char x) {\n"
" Foo(x, 0);\n"
" do_something();\n"
" }\n"
" Foo(char x, int y) { }\n"
"};\n";
check(code, "test.cpp");
ASSERT_EQUALS("[test.cpp:4]: (style) Instance of 'Foo' object is destroyed immediately.\n", errout.str());
}
void testMisusedScopeObjectStandardType() {
check("int g();\n"
"void f(int i) {\n"
" int();\n"
" int(0);\n"
" int( g() );\n" // don't warn
" int{};\n"
" int{ 0 };\n"
" int{ i };\n"
" int{ g() };\n" // don't warn
" g();\n"
"}\n", "test.cpp");
ASSERT_EQUALS("[test.cpp:3]: (style) Instance of 'int' object is destroyed immediately.\n"
"[test.cpp:4]: (style) Instance of 'int' object is destroyed immediately.\n"
"[test.cpp:6]: (style) Instance of 'int' object is destroyed immediately.\n"
"[test.cpp:7]: (style) Instance of 'int' object is destroyed immediately.\n"
"[test.cpp:8]: (style) Instance of 'int' object is destroyed immediately.\n",
errout.str());
check("void f(int j) {\n"
" for (; bool(j); ) {}\n"
"}\n", "test.cpp");
ASSERT_EQUALS("", errout.str());
check("void g() {\n"
" float (f);\n"
" float (*p);\n"
"}\n", "test.cpp");
ASSERT_EQUALS("", errout.str());
check("int f(int i) {\n"
" void();\n"
" return i;\n"
"}\n", "test.cpp");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectNamespace() {
check("namespace M {\n" // #4779
" namespace N {\n"
" struct S {};\n"
" }\n"
"}\n"
"int f() {\n"
" M::N::S();\n"
" return 0;\n"
"}\n", "test.cpp");
ASSERT_EQUALS("[test.cpp:7]: (style) Instance of 'M::N::S' object is destroyed immediately.\n", errout.str());
check("void f() {\n" // #10057
" std::string(\"abc\");\n"
" std::string{ \"abc\" };\n"
" std::pair<int, int>(1, 2);\n"
" (void)0;\n"
"}\n", "test.cpp");
ASSERT_EQUALS("[test.cpp:2]: (style) Instance of 'std::string' object is destroyed immediately.\n"
"[test.cpp:3]: (style) Instance of 'std::string' object is destroyed immediately.\n"
"[test.cpp:4]: (style) Instance of 'std::pair' object is destroyed immediately.\n",
errout.str());
check("struct S {\n" // #10083
" void f() {\n"
" std::lock_guard<std::mutex>(m);\n"
" }\n"
" void g() {\n"
" std::scoped_lock<std::mutex>(m);\n"
" }\n"
" void h() {\n"
" std::scoped_lock(m);\n"
" }\n"
" std::mutex m;\n"
"}\n", "test.cpp");
ASSERT_EQUALS("[test.cpp:3]: (style) Instance of 'std::lock_guard' object is destroyed immediately.\n"
"[test.cpp:6]: (style) Instance of 'std::scoped_lock' object is destroyed immediately.\n"
"[test.cpp:9]: (style) Instance of 'std::scoped_lock' object is destroyed immediately.\n",
errout.str());
check("struct S { int i; };\n"
"namespace {\n"
" S s() { return ::S{42}; }\n"
"}\n", "test.cpp");
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectAssignment() { // #11371
check("struct S;\n"
"S f();\n"
"S& g();\n"
"S&& h();\n"
"S* i();\n"
"void t0() { f() = {}; }\n"
"void t1() { g() = {}; }\n"
"void t2() { h() = {}; }\n"
"void t3() { *i() = {}; }\n", "test.cpp");
ASSERT_EQUALS("[test.cpp:6]: (style) Instance of 'S' object is destroyed immediately, assignment has no effect.\n", errout.str());
}
void trac2084() {
check("void f()\n"
"{\n"
" struct sigaction sa;\n"
"\n"
" { sigaction(SIGHUP, &sa, 0); };\n"
" { sigaction(SIGINT, &sa, 0); };\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void trac2071() {
check("void f() {\n"
" struct AB {\n"
" AB(int a) { }\n"
" };\n"
"\n"
" const AB ab[3] = { AB(0), AB(1), AB(2) };\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void clarifyCalculation() {
check("int f(char c) {\n"
" return 10 * (c == 0) ? 1 : 2;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '*' and '?'.\n", errout.str());
check("void f(char c) {\n"
" printf(\"%i\", 10 * (c == 0) ? 1 : 2);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '*' and '?'.\n", errout.str());
check("void f() {\n"
" return (2*a)?b:c;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char c) {\n"
" printf(\"%i\", a + b ? 1 : 2);\n"
"}",nullptr,false,false);
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '+' and '?'.\n", errout.str());
check("void f() {\n"
" std::cout << x << y ? 2 : 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '<<' and '?'.\n", errout.str());
check("void f() {\n"
" int ab = a - b ? 2 : 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '-' and '?'.\n", errout.str());
check("void f() {\n"
" int ab = a | b ? 2 : 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '|' and '?'.\n", errout.str());
// ticket #195
check("int f(int x, int y) {\n"
" return x >> ! y ? 8 : 2;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '>>' and '?'.\n", errout.str());
check("int f() {\n"
" return shift < sizeof(int64_t)*8 ? 1 : 2;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() { a = *p ? 1 : 2; }");
ASSERT_EQUALS("", errout.str());
check("void f(int x) { const char *p = x & 1 ? \"1\" : \"0\"; }");
ASSERT_EQUALS("", errout.str());
check("void foo() { x = a % b ? \"1\" : \"0\"; }");
ASSERT_EQUALS("", errout.str());
check("void f(int x) { return x & 1 ? '1' : '0'; }");
ASSERT_EQUALS("", errout.str());
check("void f(int x) { return x & 16 ? 1 : 0; }");
ASSERT_EQUALS("", errout.str());
check("void f(int x) { return x % 16 ? 1 : 0; }");
ASSERT_EQUALS("", errout.str());
check("enum {X,Y}; void f(int x) { return x & Y ? 1 : 0; }");
ASSERT_EQUALS("", errout.str());
}
void clarifyStatement() {
check("char* f(char* c) {\n"
" *c++;\n"
" return c;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2]: (warning, inconclusive) Found suspicious operator '*', result is not used.\n"
"[test.cpp:2]: (warning) In expression like '*A++' the result of '*' is unused. Did you intend to write '(*A)++;'?\n",
errout.str());
check("char* f(char** c) {\n"
" *c[5]--;\n"
" return *c;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2]: (warning, inconclusive) Found suspicious operator '*', result is not used.\n"
"[test.cpp:2]: (warning) In expression like '*A++' the result of '*' is unused. Did you intend to write '(*A)++;'?\n",
errout.str());
check("void f(Foo f) {\n"
" *f.a++;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2]: (warning, inconclusive) Found suspicious operator '*', result is not used.\n"
"[test.cpp:2]: (warning) In expression like '*A++' the result of '*' is unused. Did you intend to write '(*A)++;'?\n",
errout.str());
check("void f(Foo f) {\n"
" *f.a[5].v[3]++;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2]: (warning, inconclusive) Found suspicious operator '*', result is not used.\n"
"[test.cpp:2]: (warning) In expression like '*A++' the result of '*' is unused. Did you intend to write '(*A)++;'?\n",
errout.str());
check("void f(Foo f) {\n"
" *f.a(1, 5).v[x + y]++;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2]: (warning, inconclusive) Found suspicious operator '*', result is not used.\n"
"[test.cpp:2]: (warning) In expression like '*A++' the result of '*' is unused. Did you intend to write '(*A)++;'?\n",
errout.str());
check("char* f(char* c) {\n"
" (*c)++;\n"
" return c;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(char* c) {\n"
" bar(*c++);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("char*** f(char*** c) {\n"
" ***c++;\n"
" return c;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2]: (warning, inconclusive) Found suspicious operator '*', result is not used.\n"
"[test.cpp:2]: (warning) In expression like '*A++' the result of '*' is unused. Did you intend to write '(*A)++;'?\n",
errout.str());
check("char** f(char*** c) {\n"
" **c[5]--;\n"
" return **c;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2]: (warning, inconclusive) Found suspicious operator '*', result is not used.\n"
"[test.cpp:2]: (warning) In expression like '*A++' the result of '*' is unused. Did you intend to write '(*A)++;'?\n",
errout.str());
check("char*** f(char*** c) {\n"
" (***c)++;\n"
" return c;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(const int*** p) {\n" // #10923
" delete[] **p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void *f(char** c) {\n"
" bar(**c++);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void *f(char* p) {\n"
" for (p = path; *p++;) ;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" std::array<std::array<double,3>,3> array;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(const std::vector<int*>& v) {\n" // #12088
" for (auto it = v.begin(); it != v.end(); delete *it++);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateBranch() {
check("void f(int a, int &b) {\n"
" if (a)\n"
" b = 1;\n"
" else\n"
" b = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:2]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a) {\n"
" if (a == 1)\n"
" b = 2;\n"
" else\n"
" b = 2;\n"
" } else\n"
" b = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:3]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a == 1)\n"
" b = 1;\n"
" else {\n"
" if (a)\n"
" b = 2;\n"
" else\n"
" b = 2;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:5]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\n", errout.str());
check("int f(int signed, unsigned char value) {\n"
" int ret;\n"
" if (signed)\n"
" ret = (signed char)value;\n" // cast must be kept so the simplifications and verification is skipped
" else\n"
" ret = (unsigned char)value;\n"
" return ret;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" if (b)\n"
" __asm__(\"mov ax, bx\");\n"
" else\n"
" __asm__(\"mov bx, bx\");\n"
"}");
ASSERT_EQUALS("", errout.str()); // #3407
check("void f() {\n"
" if (b)\n"
" __asm__(\"mov ax, bx\");\n"
" else\n"
" __asm__(\"mov ax, bx\");\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:2]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\n", errout.str());
}
void duplicateBranch1() {
// tests inspired by http://www.viva64.com/en/b/0149/ ( Comparison between PVS-Studio and cppcheck )
// Errors detected in Quake 3: Arena by PVS-Studio: Fragment 2
check("void f()\n"
"{\n"
" if (front < 0)\n"
" frac = front/(front-back);\n"
" else\n"
" frac = front/(front-back);\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:3]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\n", errout.str());
check("void f()\n"
"{\n"
" if (front < 0)\n"
" { frac = front/(front-back);}\n"
" else\n"
" frac = front/((front-back));\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:3]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\n", errout.str());
// No message about empty branches (#5354)
check("void f()\n"
"{\n"
" if (front < 0)\n"
" {}\n"
" else\n"
" {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateBranch2() {
checkP("#define DOSTUFF1 ;\n"
"#define DOSTUFF2 ;\n"
"void f(int x) {\n" // #4329
" if (x)\n"
" DOSTUFF1\n"
" else\n"
" DOSTUFF2\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateBranch3() {
check("void f(bool b, int i) {\n"
" int j = i;\n"
" if (b) {\n"
" x = i;\n"
" } else {\n"
" x = j;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:5] -> [test.cpp:3]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\n"
"[test.cpp:2]: (style) The scope of the variable 'j' can be reduced.\n",
errout.str());
check("void f(bool b, int i) {\n"
" int j = i;\n"
" i++;\n"
" if (b) {\n"
" x = i;\n"
" } else {\n"
" x = j;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateBranch4() {
check("void* f(bool b) {\n"
" if (b) {\n"
" return new A::Y(true);\n"
" } else {\n"
" return new A::Z(true);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateBranch5() {
check("void f(bool b) {\n"
" int j;\n"
" if (b) {\n"
" unsigned int i = 0;\n"
" j = i;\n"
" } else {\n"
" unsigned int i = 0;\n"
" j = i;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:3]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\n", errout.str());
check("void f(bool b) {\n"
" int j;\n"
" if (b) {\n"
" unsigned int i = 0;\n"
" j = i;\n"
" } else {\n"
" unsigned int i = 0;\n"
" j = 1;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(bool b) {\n"
" int j;\n"
" if (b) {\n"
" unsigned int i = 0;\n"
" } else {\n"
" int i = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(bool b) {\n"
" int j;\n"
" if (b) {\n"
" unsigned int i = 0;\n"
" j = i;\n"
" } else {\n"
" int i = 0;\n"
" j = i;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateBranch6() {
check("void f(bool b) {\n"
" if (b) {\n"
" } else {\n"
" int i = 0;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(bool b) {\n"
" if (b) {\n"
" int i = 0;\n"
" } else {\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression1() {
check("void foo(int a) {\n"
" if (a == a) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
check("void fun(int b) {\n"
" return a && a ||\n"
" b == b &&\n"
" d > d &&\n"
" e < e &&\n"
" f ;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&&'.\n"
"[test.cpp:3]: (style) Same expression on both sides of '=='.\n"
"[test.cpp:4]: (style) Same expression on both sides of '>'.\n"
"[test.cpp:5]: (style) Same expression on both sides of '<'.\n", errout.str());
check("void foo() {\n"
" return a && a;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&&'.\n", errout.str());
check("void foo() {\n"
" a = b && b;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&&'.\n", errout.str());
check("void foo(int b) {\n"
" f(a,b == b);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
check("void foo(int b) {\n"
" f(b == b, a);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
check("void foo() {\n"
" if (x!=2 || x!=2) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void foo(int a, int b) {\n"
" if ((a < b) && (b > a)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&&' because 'a<b' and 'b>a' represent the same value.\n", errout.str());
check("void foo(int a, int b) {\n"
" if ((a <= b) && (b >= a)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&&' because 'a<=b' and 'b>=a' represent the same value.\n", errout.str());
check("void foo() {\n"
" if (x!=2 || y!=3 || x!=2) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression 'x!=2' found multiple times in chain of '||' operators.\n", errout.str());
check("void foo() {\n"
" if (x!=2 && (x=y) && x!=2) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" if (a && b || a && b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void foo() {\n"
" if (a && b || b && c) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" if (a && b | b && c) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '|'.\n", errout.str());
check("void foo() {\n"
" if ((a + b) | (a + b)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '|'.\n", errout.str());
check("void foo() {\n"
" if ((a | b) & (a | b)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&'.\n", errout.str());
check("void foo(int a, int b) {\n"
" if ((a | b) == (a | b)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
check("void foo() {\n"
" if (a1[a2[c & 0xff] & 0xff]) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void d(const char f, int o, int v)\n"
"{\n"
" if (((f=='R') && (o == 1) && ((v < 2) || (v > 99))) ||\n"
" ((f=='R') && (o == 2) && ((v < 2) || (v > 99))) ||\n"
" ((f=='T') && (o == 2) && ((v < 200) || (v > 9999)))) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(int x) { return x+x; }");
ASSERT_EQUALS("", errout.str());
check("void f(int x) { while (x+=x) ; }");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" if (a && b && b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&&'.\n", errout.str());
check("void foo() {\n"
" if (a || b || b) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void foo() {\n"
" if (a / 1000 / 1000) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int foo(int i) {\n"
" return i/i;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '/'.\n", errout.str());
check("void foo() {\n"
" if (a << 1 << 1) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() { return !!y; }"); // No FP
ASSERT_EQUALS("", errout.str());
// make sure there are not "same expression" fp when there are different casts
check("void f(long x) { if ((int32_t)x == (int64_t)x) {} }",
nullptr, // filename
false, // inconclusive
false, // runSimpleChecks
false, // verbose
nullptr // settings
);
ASSERT_EQUALS("", errout.str());
// make sure there are not "same expression" fp when there are different ({}) expressions
check("void f(long x) { if (({ 1+2; }) == ({3+4;})) {} }");
ASSERT_EQUALS("", errout.str());
// #5535: Reference named like its type
check("void foo() { UMSConfig& UMSConfig = GetUMSConfiguration(); }");
ASSERT_EQUALS("[test.cpp:1]: (style) Variable 'UMSConfig' can be declared as reference to const\n", errout.str());
// #3868 - false positive (same expression on both sides of |)
check("void f(int x) {\n"
" a = x ? A | B | C\n"
" : A | B;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(const Bar &bar) {\n"
" bool a = bar.isSet() && bar->isSet();\n"
" bool b = bar.isSet() && bar.isSet();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Same expression on both sides of '&&'.\n", errout.str());
check("void foo(int a, int b) {\n"
" if ((b + a) | (a + b)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '|' because 'b+a' and 'a+b' represent the same value.\n", errout.str());
check("void foo(const std::string& a, const std::string& b) {\n"
" return a.find(b+\"&\") || a.find(\"&\"+b);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a, int b) {\n"
" if ((b > a) | (a > b)) {}\n" // > is not commutative
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(double a, double b) {\n"
" if ((b + a) > (a + b)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The comparison 'b+a > a+b' is always false because 'b+a' and 'a+b' represent the same value.\n", errout.str());
check("void f(int x) {\n"
" if ((x == 1) && (x == 0x00000001))\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&&' because 'x==1' and 'x==0x00000001' represent the same value.\n", errout.str());
check("void f() {\n"
" enum { Four = 4 };\n"
" if (Four == 4) {}"
"}", nullptr, true, false);
ASSERT_EQUALS("[test.cpp:3]: (style) The comparison 'Four == 4' is always true.\n",
errout.str());
check("void f() {\n"
" enum { Four = 4 };\n"
" static_assert(Four == 4, \"\");\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" enum { Four = 4 };\n"
" static_assert(4 == Four, \"\");\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" enum { FourInEnumOne = 4 };\n"
" enum { FourInEnumTwo = 4 };\n"
" if (FourInEnumOne == FourInEnumTwo) {}\n"
"}", nullptr, true, false);
ASSERT_EQUALS("[test.cpp:4]: (style) The comparison 'FourInEnumOne == FourInEnumTwo' is always true because 'FourInEnumOne' and 'FourInEnumTwo' represent the same value.\n",
errout.str());
check("void f() {\n"
" enum { FourInEnumOne = 4 };\n"
" enum { FourInEnumTwo = 4 };\n"
" static_assert(FourInEnumOne == FourInEnumTwo, \"\");\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int a, int b) {\n"
" if (sizeof(a) == sizeof(a)) { }\n"
" if (sizeof(a) == sizeof(b)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
check("float bar(int) __attribute__((pure));\n"
"char foo(int) __attribute__((pure));\n"
"int test(int a, int b) {\n"
" if (bar(a) == bar(a)) { }\n"
" if (unknown(a) == unknown(a)) { }\n"
" if (foo(a) == foo(a)) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (style) Same expression on both sides of '=='.\n", errout.str());
}
void duplicateExpression2() { // check if float is NaN or Inf
check("int f(long double ldbl, double dbl, float flt) {\n" // ticket #2730
" if (ldbl != ldbl) have_nan = 1;\n"
" if (!(dbl == dbl)) have_nan = 1;\n"
" if (flt != flt) have_nan = 1;\n"
" return have_nan;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("float f(float x) { return x-x; }"); // ticket #4485 (Inf)
ASSERT_EQUALS("", errout.str());
check("float f(float x) { return (X double)x == (X double)x; }", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("struct X { float f; };\n"
"float f(struct X x) { return x.f == x.f; }");
ASSERT_EQUALS("", errout.str());
check("struct X { int i; };\n"
"int f(struct X x) { return x.i == x.i; }");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
// #5284 - when type is unknown, assume it's float
check("int f() { return x==x; }");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression3() {
constexpr char xmldata[] = "<?xml version=\"1.0\"?>\n"
"<def>\n"
" <function name=\"mystrcmp\">\n"
" <pure/>\n"
" <arg nr=\"1\"/>\n"
" <arg nr=\"2\"/>\n"
" </function>\n"
"</def>";
Settings settings = settingsBuilder().libraryxml(xmldata, sizeof(xmldata)).build();
check("void foo() {\n"
" if (x() || x()) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" void foo() const;\n"
" bool bar() const;\n"
"};\n"
"void A::foo() const {\n"
" if (bar() && bar()) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (style) Same expression on both sides of '&&'.\n", errout.str());
check("struct A {\n"
" void foo();\n"
" bool bar();\n"
" bool bar() const;\n"
"};\n"
"void A::foo() {\n"
" if (bar() && bar()) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class B {\n"
" void bar(int i);\n"
"};\n"
"class A {\n"
" void bar(int i) const;\n"
"};\n"
"void foo() {\n"
" B b;\n"
" A a;\n"
" if (b.bar(1) && b.bar(1)) {}\n"
" if (a.bar(1) && a.bar(1)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:11]: (style) Same expression on both sides of '&&'.\n", errout.str());
check("class D { void strcmp(); };\n"
"void foo() {\n"
" D d;\n"
" if (d.strcmp() && d.strcmp()) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" if ((mystrcmp(a, b) == 0) || (mystrcmp(a, b) == 0)) {}\n"
"}", "test.cpp", false, true, false, &settings);
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void GetValue() { return rand(); }\n"
"void foo() {\n"
" if ((GetValue() == 0) || (GetValue() == 0)) { dostuff(); }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void __attribute__((const)) GetValue() { return X; }\n"
"void foo() {\n"
" if ((GetValue() == 0) || (GetValue() == 0)) { dostuff(); }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void GetValue() __attribute__((const));\n"
"void GetValue() { return X; }\n"
"void foo() {\n"
" if ((GetValue() == 0) || (GetValue() == 0)) { dostuff(); }\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void foo() {\n"
" if (str == \"(\" || str == \"(\") {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void foo() {\n"
" if (bar(a) && !strcmp(a, b) && bar(a) && !strcmp(a, b)) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// #5334
check("void f(C *src) {\n"
" if (x<A*>(src) || x<B*>(src))\n"
" a++;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(A *src) {\n"
" if (dynamic_cast<B*>(src) || dynamic_cast<B*>(src)) {}\n"
"}\n", "test.cpp", false, false); // don't run simplifications
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||'.\n", errout.str());
// #5819
check("Vector func(Vector vec1) {\n"
" return fabs(vec1 & vec1 & vec1);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("Vector func(int vec1) {\n"
" return fabs(vec1 & vec1 & vec1);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '&'.\n", errout.str());
}
void duplicateExpression4() {
check("void foo() {\n"
" if (*a++ != b || *a++ != b) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" if (*a-- != b || *a-- != b) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// assignment
check("void f() {\n"
" while (*(a+=2)==*(b+=2) && *(a+=2)==*(b+=2)) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression5() { // #3749 - macros with same values
check("void f() {\n"
" if ($a == $a) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression6() { // #4639
check("float IsNan(float value) { return !(value == value); }\n"
"double IsNan(double value) { return !(value == value); }\n"
"long double IsNan(long double value) { return !(value == value); }");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression7() {
check("void f() {\n"
" const int i = sizeof(int);\n"
" if ( i != sizeof (int)){}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'i != sizeof(int)' is always false because 'i' and 'sizeof(int)' represent the same value.\n", errout.str());
check("void f() {\n"
" const int i = sizeof(int);\n"
" if ( sizeof (int) != i){}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'sizeof(int) != i' is always false because 'sizeof(int)' and 'i' represent the same value.\n", errout.str());
check("void f(int a = 1) { if ( a != 1){}}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 1;\n"
" if ( a != 1){}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'a != 1' is always false.\n", errout.str());
check("void f() {\n"
" int a = 1;\n"
" int b = 1;\n"
" if ( a != b){}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3] -> [test.cpp:4]: (style) The comparison 'a != b' is always false because 'a' and 'b' represent the same value.\n", errout.str());
check("void f() {\n"
" int a = 1;\n"
" int b = a;\n"
" if ( a != b){}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) The comparison 'a != b' is always false because 'a' and 'b' represent the same value.\n", errout.str());
check("void use(int);\n"
"void f() {\n"
" int a = 1;\n"
" int b = 1;\n"
" use(b);\n"
" if ( a != 1){}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:6]: (style) The comparison 'a != 1' is always false.\n", errout.str());
check("void use(int);\n"
"void f() {\n"
" int a = 1;\n"
" use(a);\n"
" a = 2;\n"
" if ( a != 1){}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void use(int);\n"
"void f() {\n"
" int a = 2;\n"
" use(a);\n"
" a = 1;\n"
" if ( a != 1){}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("const int a = 1;\n"
"void f() {\n"
" if ( a != 1){}\n"
"}");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:3]: (style) The comparison 'a != 1' is always false.\n", errout.str());
check("int a = 1;\n"
" void f() {\n"
" if ( a != 1){}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" static const int a = 1;\n"
" if ( a != 1){}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'a != 1' is always false.\n", errout.str());
check("void f() {\n"
" static int a = 1;\n"
" if ( a != 1){}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 1;\n"
" if ( a != 1){\n"
" a++;\n"
" }}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'a != 1' is always false.\n", errout.str());
check("void f(int b) {\n"
" int a = 1;\n"
" while (b) {\n"
" if ( a != 1){}\n"
" a++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("bool f(bool a, bool b) {\n"
" const bool c = a;\n"
" return a && b && c;\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Same expression 'a' found multiple times in chain of '&&' operators because 'a' and 'c' represent the same value.\n",
errout.str());
// 6906
check("void f(const bool b) {\n"
" const bool b1 = !b;\n"
" if(!b && b1){}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Same expression on both sides of '&&' because '!b' and 'b1' represent the same value.\n", errout.str());
// 7284
check("void f(void) {\n"
" if (a || !!a) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||' because 'a' and '!!a' represent the same value.\n", errout.str());
// 8205
check("void f(int x) {\n"
" int Diag = 0;\n"
" switch (x) {\n"
" case 12:\n"
" if (Diag==0) {}\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:5]: (style) The comparison 'Diag == 0' is always true.\n", errout.str());
// #9744
check("void f(const std::vector<int>& ints) {\n"
" int i = 0;\n"
" for (int p = 0; i < ints.size(); ++i) {\n"
" if (p == 0) {}\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) The comparison 'p == 0' is always true.\n", errout.str());
// #11820
check("unsigned f(unsigned x) {\n"
" return x - !!x;\n"
"}\n"
"unsigned g(unsigned x) {\n"
" return !!x - x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression8() {
check("void f() {\n"
" int a = 1;\n"
" int b = a;\n"
" a = 2;\n"
" if ( b != a){}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int * a, int i) { int b = a[i]; a[i] = 2; if ( b != a[i]){}}");
ASSERT_EQUALS("", errout.str());
check("void f(int * a, int i) { int b = *a; *a = 2; if ( b != *a){}}");
ASSERT_EQUALS("", errout.str());
check("struct A { int f() const; };\n"
"A g();\n"
"void foo() {\n"
" for (A x = A();;) {\n"
" const int a = x.f();\n"
" x = g();\n"
" if (x.f() == a) break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(int i);\n"
"struct A {\n"
" enum E { B, C };\n"
" bool f(E);\n"
"};\n"
"void foo() {\n"
" A a;\n"
" const bool x = a.f(A::B);\n"
" const bool y = a.f(A::C);\n"
" if(!x && !y) return;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" const bool x = a.f(A::B);\n"
" const bool y = a.f(A::C);\n"
" if (!x && !y) return;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(bool * const b);\n"
"void foo() {\n"
" bool x = true;\n"
" bool y = true;\n"
" f(&x);\n"
" if (!x && !y) return;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" const int a = {};\n"
" if(a == 1) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("volatile const int var = 42;\n"
"void f() { if(var == 42) {} }");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 0;\n"
" struct b c;\n"
" c.a = &a;\n"
" g(&c);\n"
" if (a == 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression9() {
// #9320
check("void f() {\n"
" uint16_t x = 1000;\n"
" uint8_t y = x;\n"
" if (x != y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression10() {
// #9485
check("int f() {\n"
" const int a = 1;\n"
" const int b = a-1;\n"
" const int c = a+1;\n"
" return c;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression11() {
check("class Fred {\n"
"public:\n"
" double getScale() const { return m_range * m_zoom; }\n"
" void setZoom(double z) { m_zoom = z; }\n"
" void dostuff(int);\n"
"private:\n"
" double m_zoom;\n"
" double m_range;\n"
"};\n"
"\n"
"void Fred::dostuff(int x) {\n"
" if (x == 43) {\n"
" double old_scale = getScale();\n"
" setZoom(m_zoom + 1);\n"
" double scale_ratio = getScale() / old_scale;\n" // <- FP
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression12() { //#10026
check("int f(const std::vector<int> &buffer, const uint8_t index)\n"
"{\n"
" int var = buffer[index - 1];\n"
" return buffer[index - 1] - var;\n" // <<
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) Same expression on both sides of '-'.\n", errout.str());
}
void duplicateExpression13() { //#7899
check("void f() {\n"
" if (sizeof(long) == sizeof(long long)) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression14() { //#9871
check("int f() {\n"
" int k = 7;\n"
" int* f = &k;\n"
" int* g = &k;\n"
" return (f + 4 != g + 4);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4] -> [test.cpp:5]: (style) The comparison 'f+4 != g+4' is always false because 'f+4' and 'g+4' represent the same value.\n", errout.str());
}
void duplicateExpression15() { //#10650
check("bool f() {\n"
" const int i = int(0);\n"
" return i == 0;\n"
"}\n"
"bool g() {\n"
" const int i = int{ 0 };\n"
" return i == 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'i == 0' is always true.\n"
"[test.cpp:6] -> [test.cpp:7]: (style) The comparison 'i == 0' is always true.\n",
errout.str());
}
void duplicateExpression16() {
check("void f(const std::string& a) {\n" //#10569
" if ((a == \"x\") ||\n"
" (a == \"42\") ||\n"
" (a == \"y\") ||\n"
" (a == \"42\")) {}\n"
"}\n"
"void g(const std::string& a) {\n"
" if ((a == \"42\") ||\n"
" (a == \"x\") ||\n"
" (a == \"42\") ||\n"
" (a == \"y\")) {}\n"
"}\n"
"void h(const std::string& a) {\n"
" if ((a == \"42\") ||\n"
" (a == \"x\") ||\n"
" (a == \"y\") ||\n"
" (a == \"42\")) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:4]: (style) Same expression 'a==\"42\"' found multiple times in chain of '||' operators.\n"
"[test.cpp:7] -> [test.cpp:9]: (style) Same expression 'a==\"42\"' found multiple times in chain of '||' operators.\n"
"[test.cpp:13] -> [test.cpp:16]: (style) Same expression 'a==\"42\"' found multiple times in chain of '||' operators.\n",
errout.str());
check("void f(const char* s) {\n" // #6371
" if (*s == '\x0F') {\n"
" if (!s[1] || !s[2] || !s[1])\n"
" break;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Same expression '!s[1]' found multiple times in chain of '||' operators.\n", errout.str());
}
void duplicateExpression17() {
check("enum { E0 };\n" // #12036
"void f() {\n"
" if (0 > E0) {}\n"
" if (E0 > 0) {}\n"
" if (E0 == 0) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) The comparison '0 > E0' is always false.\n"
"[test.cpp:4]: (style) The comparison 'E0 > 0' is always false.\n"
"[test.cpp:5]: (style) The comparison 'E0 == 0' is always true.\n",
errout.str());
check("struct S {\n" // #12040, #12044
" static const int I = 0;\n"
" enum { E0 };\n"
" enum F { F0 };\n"
" void f() {\n"
" if (0 > I) {}\n"
" if (0 > S::I) {}\n"
" if (0 > E0) {}\n"
" if (0 > S::E0) {}\n"
" }\n"
"};\n"
"void g() {\n"
" if (0 > S::I) {}\n"
" if (0 > S::E0) {}\n"
" if (0 > S::F::F0) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:6]: (style) The comparison '0 > I' is always false.\n"
"[test.cpp:2] -> [test.cpp:7]: (style) The comparison '0 > S::I' is always false.\n"
"[test.cpp:8]: (style) The comparison '0 > E0' is always false.\n"
"[test.cpp:9]: (style) The comparison '0 > S::E0' is always false.\n"
"[test.cpp:2] -> [test.cpp:13]: (style) The comparison '0 > S::I' is always false.\n"
"[test.cpp:14]: (style) The comparison '0 > S::E0' is always false.\n"
"[test.cpp:15]: (style) The comparison '0 > S::F::F0' is always false.\n",
errout.str());
check("template<typename T, typename U>\n" // #12122
"void f() {\n"
" static_assert(std::is_same<T, U>::value || std::is_integral<T>::value);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpressionLoop() {
check("void f() {\n"
" int a = 1;\n"
" while ( a != 1){}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'a != 1' is always false.\n", errout.str());
check("void f() { int a = 1; while ( a != 1){ a++; }}");
ASSERT_EQUALS("", errout.str());
check("void f() { int a = 1; for ( int i=0; i < 3 && a != 1; i++){ a++; }}");
ASSERT_EQUALS("", errout.str());
check("void f(int b) { int a = 1; while (b) { if ( a != 1){} b++; } a++; }");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" for(int i = 0; i < 10;) {\n"
" if( i != 0 ) {}\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'i != 0' is always false.\n", errout.str());
check("void f() {\n"
" for(int i = 0; i < 10;) {\n"
" if( i != 0 ) {}\n"
" i++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" for(int i = 0; i < 10;) {\n"
" if( i != 0 ) { i++; }\n"
" i++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" for(int i = 0; i < 10;) {\n"
" if( i != 0 ) { i++; }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int i = 0;\n"
" while(i < 10) {\n"
" if( i != 0 ) {}\n"
" i++;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int b) {\n"
" while (b) {\n"
" int a = 1;\n"
" if ( a != 1){}\n"
" b++;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) The comparison 'a != 1' is always false.\n", errout.str());
check("struct T {\n" // #11083
" std::string m;\n"
" const std::string & str() const { return m; }\n"
" T* next();\n"
"};\n"
"void f(T* t) {\n"
" const std::string& s = t->str();\n"
" while (t && t->str() == s)\n"
" t = t->next();\n"
" do {\n"
" t = t->next();\n"
" } while (t && t->str() == s);\n"
" for (; t && t->str() == s; t = t->next());\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpressionTernary() { // #6391
check("void f() {\n"
" return A ? x : x;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression in both branches of ternary operator.\n", errout.str());
check("int f(bool b, int a) {\n"
" const int c = a;\n"
" return b ? a : c;\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Same expression in both branches of ternary operator.\n", errout.str());
check("void f() {\n"
" return A ? x : z;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(unsigned char c) {\n"
" x = y ? (signed char)c : (unsigned char)c;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("std::string stringMerge(std::string const& x, std::string const& y) {\n" // #7938
" return ((x > y) ? (y + x) : (x + y));\n"
"}");
ASSERT_EQUALS("", errout.str());
// #6426
{
const char code[] = "void foo(bool flag) {\n"
" bar( (flag) ? ~0u : ~0ul);\n"
"}";
Settings settings = _settings;
settings.platform.sizeof_int = 4;
settings.platform.int_bit = 32;
settings.platform.sizeof_long = 4;
settings.platform.long_bit = 32;
check(code, &settings);
ASSERT_EQUALS("[test.cpp:2]: (style) Same value in both branches of ternary operator.\n", errout.str());
settings.platform.sizeof_long = 8;
settings.platform.long_bit = 64;
check(code, &settings);
ASSERT_EQUALS("", errout.str());
}
}
void duplicateValueTernary() {
check("void f() {\n"
" if( a ? (b ? false:false): false ) ;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("int f1(int a) {return (a == 1) ? (int)1 : 1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("int f2(int a) {return (a == 1) ? (int)1 : (int)1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("int f3(int a) {return (a == 1) ? 1 : (int)1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("int f4(int a) {return (a == 1) ? 1 : 1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("int f5(int a) {return (a == (int)1) ? (int)1 : 1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("int f6(int a) {return (a == (int)1) ? (int)1 : (int)1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("int f7(int a) {return (a == (int)1) ? 1 : (int)1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("int f8(int a) {return (a == (int)1) ? 1 : 1; }");
ASSERT_EQUALS("[test.cpp:1]: (style) Same value in both branches of ternary operator.\n", errout.str());
check("struct Foo {\n"
" std::vector<int> bar{1,2,3};\n"
" std::vector<int> baz{4,5,6};\n"
"};\n"
"void f() {\n"
" Foo foo;\n"
" it = true ? foo.bar.begin() : foo.baz.begin();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(bool b) {\n"
" std::vector<int> bar{1,2,3};\n"
" std::vector<int> baz{4,5,6};\n"
" std::vector<int> v = b ? bar : baz;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(bool q) {\n" // #9570
" static int a = 0;\n"
" static int b = 0;\n"
" int& x = q ? a : b;\n"
" ++x;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { int a, b; };\n" // #10107
"S f(bool x, S s) {\n"
" (x) ? f.a = 42 : f.b = 42;\n"
" return f;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("float f(float x) {\n" // # 11368
" return (x >= 0.0) ? 0.0 : -0.0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpressionTemplate() {
check("template <int I> void f() {\n" // #6930
" if (I >= 0 && I < 3) {}\n"
"}\n"
"\n"
"static auto a = f<0>();");
ASSERT_EQUALS("", errout.str());
check("template<typename T>\n" // #7754
"void f() {\n"
" if (std::is_same_v<T, char> || std::is_same_v<T, unsigned char>) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("typedef long long int64_t;"
"template<typename T>\n"
"void f() {\n"
" if (std::is_same_v<T, long> || std::is_same_v<T, int64_t>) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkP("#define int32_t int"
"template<typename T>\n"
"void f() {\n"
" if (std::is_same_v<T, int> || std::is_same_v<T, int32_t>) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpressionCompareWithZero() {
check("void f(const int* x, bool b) {\n"
" if ((x && b) || (x != 0 && b)) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||' because 'x&&b' and 'x!=0&&b' represent the same value.\n", errout.str());
check("void f(const int* x, bool b) {\n"
" if ((x != 0 && b) || (x && b)) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||' because 'x!=0&&b' and 'x&&b' represent the same value.\n", errout.str());
check("void f(const int* x, bool b) {\n"
" if ((x && b) || (b && x != 0)) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||' because 'x&&b' and 'b&&x!=0' represent the same value.\n", errout.str());
check("void f(const int* x, bool b) {\n"
" if ((!x && b) || (x == 0 && b)) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||' because '!x&&b' and 'x==0&&b' represent the same value.\n", errout.str());
check("void f(const int* x, bool b) {\n"
" if ((x == 0 && b) || (!x && b)) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||' because 'x==0&&b' and '!x&&b' represent the same value.\n", errout.str());
check("void f(const int* x, bool b) {\n"
" if ((!x && b) || (b && x == 0)) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Same expression on both sides of '||' because '!x&&b' and 'b&&x==0' represent the same value.\n", errout.str());
check("struct A {\n"
" int* getX() const;\n"
" bool getB() const;\n"
" void f() {\n"
" if ((getX() && getB()) || (getX() != 0 && getB())) {}\n"
" }\n"
"};\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Same expression on both sides of '||' because 'getX()&&getB()' and 'getX()!=0&&getB()' represent the same value.\n", errout.str());
check("void f(const int* x, bool b) {\n"
" if ((x && b) || (x == 0 && b)) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(const int* x, bool b) {\n"
" if ((!x && b) || (x != 0 && b)) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void oppositeExpression() {
check("void f(bool a) { if(a && !a) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '&&'.\n", errout.str());
check("void f(bool a) { if(a != !a) {} }");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '!='.\n", errout.str());
check("void f(bool a) { if( a == !(a) ) {}}");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(bool a) { if( a != !(a) ) {}}");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '!='.\n", errout.str());
check("void f(bool a) { if( !(a) == a ) {}}");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(bool a) { if( !(a) != a ) {}}");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '!='.\n", errout.str());
check("void f(bool a) { if( !(!a) == !(a) ) {}}");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(bool a) { if( !(!a) != !(a) ) {}}");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '!='.\n", errout.str());
check("void f1(bool a) {\n"
" const bool b = a;\n"
" if( a == !(b) ) {}\n"
" if( b == !(a) ) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f2(const bool *a) {\n"
" const bool b = *a;\n"
" if( *a == !(b) ) {}\n"
" if( b == !(*a) ) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(bool a) { a = !a; }");
ASSERT_EQUALS("", errout.str());
check("void f(int a) { if( a < -a ) {}}");
ASSERT_EQUALS("[test.cpp:1]: (style) Opposite expression on both sides of '<'.\n", errout.str());
check("void f(int a) { a -= -a; }");
ASSERT_EQUALS("", errout.str());
check("void f(int a) { a = a / (-a); }");
ASSERT_EQUALS("", errout.str());
check("bool f(int i){ return !((i - 1) & i); }");
ASSERT_EQUALS("", errout.str());
check("bool f(unsigned i){ return (x > 0) && (x & (x-1)) == 0; }");
ASSERT_EQUALS("", errout.str());
check("void A::f(bool a, bool c)\n"
"{\n"
" const bool b = a;\n"
" if(c) { a = false; }\n"
" if(b && !a) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(bool c) {\n"
" const bool b = a;\n"
" if(c) { a = false; }\n"
" if(b && !a) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" bool x = a;\n"
" dostuff();\n"
" if (x && a) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" const bool b = g();\n"
" if (!b && g()) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(const bool *a) {\n"
" const bool b = a[42];\n"
" if( b == !(a[42]) ) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(const bool *a) {\n"
" const bool b = a[42];\n"
" if( a[42] == !(b) ) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(const bool *a) {\n"
" const bool b = *a;\n"
" if( b == !(*a) ) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(const bool *a) {\n"
" const bool b = *a;\n"
" if( *a == !(b) ) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Opposite expression on both sides of '=='.\n", errout.str());
check("void f(uint16_t u) {\n" // #9342
" if (u != (u & -u))\n"
" return false;\n"
" if (u != (-u & u))\n"
" return false;\n"
" return true;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateVarExpression() {
check("int f() __attribute__((pure));\n"
"int g() __attribute__((pure));\n"
"void test() {\n"
" int i = f();\n"
" int j = f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("struct Foo { int f() const; int g() const; };\n"
"void test() {\n"
" Foo f = Foo{};\n"
" int i = f.f();\n"
" int j = f.f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("struct Foo { int f() const; int g() const; };\n"
"void test() {\n"
" Foo f = Foo{};\n"
" Foo f2 = Foo{};\n"
" int i = f.f();\n"
" int j = f.f();\n"
"}");
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:5]: (style) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("int f() __attribute__((pure));\n"
"int g() __attribute__((pure));\n"
"void test() {\n"
" int i = 1 + f();\n"
" int j = 1 + f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("int f() __attribute__((pure));\n"
"int g() __attribute__((pure));\n"
"void test() {\n"
" int i = f() + 1;\n"
" int j = 1 + f();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() __attribute__((pure));\n"
"int g() __attribute__((pure));\n"
"void test() {\n"
" int x = f();\n"
" int i = x + 1;\n"
" int j = f() + 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() __attribute__((pure));\n"
"int g() __attribute__((pure));\n"
"void test() {\n"
" int i = f() + f();\n"
" int j = f() + f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("int f(int) __attribute__((pure));\n"
"int g(int) __attribute__((pure));\n"
"void test() {\n"
" int i = f(0);\n"
" int j = f(0);\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("int f(int) __attribute__((pure));\n"
"int g(int) __attribute__((pure));\n"
"void test() {\n"
" const int x = 0;\n"
" int i = f(0);\n"
" int j = f(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void test(const int * p, const int * q) {\n"
" int i = *p;\n"
" int j = *p;\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (style) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("struct A { int x; int y; };"
"void test(A a) {\n"
" int i = a.x;\n"
" int j = a.x;\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (style) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("void test() {\n"
" int i = 0;\n"
" int j = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void test() {\n"
" int i = -1;\n"
" int j = -1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(int);\n"
"void test() {\n"
" int i = f(0);\n"
" int j = f(1);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f();\n"
"int g();\n"
"void test() {\n"
" int i = f() || f();\n"
" int j = f() && f();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Foo {};\n"
"void test() {\n"
" Foo i = Foo();\n"
" Foo j = Foo();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Foo {};\n"
"void test() {\n"
" Foo i = Foo{};\n"
" Foo j = Foo{};\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct Foo { int f() const; float g() const; };\n"
"void test() {\n"
" Foo f = Foo{};\n"
" int i = f.f();\n"
" int j = f.f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("struct Foo { int f(); int g(); };\n"
"void test() {\n"
" Foo f = Foo{};\n"
" int i = f.f();\n"
" int j = f.f();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void test() {\n"
" int i = f();\n"
" int j = f();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void test(int x) {\n"
" int i = ++x;\n"
" int j = ++x;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void test(int x) {\n"
" int i = x++;\n"
" int j = x++;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void test(int x) {\n"
" int i = --x;\n"
" int j = --x;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void test(int x) {\n"
" int i = x--;\n"
" int j = x--;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void test(int x) {\n"
" int i = x + 1;\n"
" int j = 1 + x;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateVarExpressionUnique() {
check("struct SW { int first; };\n"
"void foo(SW* x) {\n"
" int start = x->first;\n"
" int end = x->first;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:3]: (style, inconclusive) Same expression used in consecutive assignments of 'start' and 'end'.\n"
"[test.cpp:2]: (style) Parameter 'x' can be declared as pointer to const\n",
errout.str());
check("struct SW { int first; };\n"
"void foo(SW* x, int i, int j) {\n"
" int start = x->first;\n"
" int end = x->first;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:3]: (style, inconclusive) Same expression used in consecutive assignments of 'start' and 'end'.\n"
"[test.cpp:2]: (style) Parameter 'x' can be declared as pointer to const\n",
errout.str());
check("struct Foo { int f() const; };\n"
"void test() {\n"
" Foo f = Foo{};\n"
" int i = f.f();\n"
" int j = f.f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("void test(const int * p) {\n"
" int i = *p;\n"
" int j = *p;\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("struct Foo { int f() const; int g(int) const; };\n"
"void test() {\n"
" Foo f = Foo{};\n"
" int i = f.f();\n"
" int j = f.f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("struct Foo { int f() const; };\n"
"void test() {\n"
" Foo f = Foo{};\n"
" int i = f.f();\n"
" int j = f.f();\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:4]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
}
void duplicateVarExpressionAssign() {
check("struct A { int x; int y; };"
"void use(int);\n"
"void test(A a) {\n"
" int i = a.x;\n"
" int j = a.x;\n"
" use(i);\n"
" i = j;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:3]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("struct A { int x; int y; };"
"void use(int);\n"
"void test(A a) {\n"
" int i = a.x;\n"
" int j = a.x;\n"
" use(j);\n"
" j = i;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:3]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n", errout.str());
check("struct A { int x; int y; };"
"void use(int);\n"
"void test(A a) {\n"
" int i = a.x;\n"
" int j = a.x;\n"
" use(j);\n"
" if (i == j) {}\n"
"}");
ASSERT_EQUALS(
"[test.cpp:4] -> [test.cpp:3]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n"
"[test.cpp:3] -> [test.cpp:4] -> [test.cpp:6]: (style) The comparison 'i == j' is always true because 'i' and 'j' represent the same value.\n",
errout.str());
check("struct A { int x; int y; };"
"void use(int);\n"
"void test(A a) {\n"
" int i = a.x;\n"
" int j = a.x;\n"
" use(j);\n"
" if (i == a.x) {}\n"
"}");
ASSERT_EQUALS(
"[test.cpp:4] -> [test.cpp:3]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n"
"[test.cpp:3] -> [test.cpp:6]: (style) The comparison 'i == a.x' is always true because 'i' and 'a.x' represent the same value.\n",
errout.str());
check("struct A { int x; int y; };"
"void use(int);\n"
"void test(A a) {\n"
" int i = a.x;\n"
" int j = a.x;\n"
" use(i);\n"
" if (j == a.x) {}\n"
"}");
ASSERT_EQUALS(
"[test.cpp:4] -> [test.cpp:3]: (style, inconclusive) Same expression used in consecutive assignments of 'i' and 'j'.\n"
"[test.cpp:4] -> [test.cpp:6]: (style) The comparison 'j == a.x' is always true because 'j' and 'a.x' represent the same value.\n",
errout.str());
// Issue #8612
check("struct P\n"
"{\n"
" void func();\n"
" bool operator==(const P&) const;\n"
"};\n"
"struct X\n"
"{\n"
" P first;\n"
" P second;\n"
"};\n"
"bool bar();\n"
"void baz(const P&);\n"
"void foo(const X& x)\n"
"{\n"
" P current = x.first;\n"
" P previous = x.first;\n"
" while (true)\n"
" {\n"
" baz(current);\n"
" if (bar() && previous == current)\n"
" {\n"
" current.func();\n"
" }\n"
" previous = current;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:16] -> [test.cpp:15]: (style, inconclusive) Same expression used in consecutive assignments of 'current' and 'previous'.\n", errout.str());
}
void duplicateVarExpressionCrash() {
// Issue #8624
check("struct X {\n"
" X();\n"
" int f() const;\n"
"};\n"
"void run() {\n"
" X x;\n"
" int a = x.f();\n"
" int b = x.f();\n"
" (void)a;\n"
" (void)b;\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:7]: (style, inconclusive) Same expression used in consecutive assignments of 'a' and 'b'.\n", errout.str());
// Issue #8712
check("void f() {\n"
" unsigned char d;\n"
" d = d % 5;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("template <typename T>\n"
"T f() {\n"
" T x = T();\n"
"}\n"
"int &a = f<int&>();");
ASSERT_EQUALS("", errout.str());
// Issue #8713
check("class A {\n"
" int64_t B = 32768;\n"
" P<uint8_t> m = MakeP<uint8_t>(B);\n"
"};\n"
"void f() {\n"
" uint32_t a = 42;\n"
" uint32_t b = uint32_t(A ::B / 1024);\n"
" int32_t c = int32_t(a / b);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Issue #8709
check("a b;\n"
"void c() {\n"
" switch (d) { case b:; }\n"
" double e(b);\n"
" if(e <= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// #10718
// Should probably not be inconclusive
check("struct a {\n"
" int b() const;\n"
" auto c() -> decltype(0) {\n"
" a d;\n"
" int e = d.b(), f = d.b();\n"
" return e + f;\n"
" }\n"
"};\n");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:5]: (style, inconclusive) Same expression used in consecutive assignments of 'e' and 'f'.\n", errout.str());
}
void multiConditionSameExpression() {
check("void f() {\n"
" int val = 0;\n"
" if (val < 0) continue;\n"
" if ((val > 0)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'val < 0' is always false.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) The comparison 'val > 0' is always false.\n", errout.str());
check("void f() {\n"
" int val = 0;\n"
" int *p = &val;n"
" val = 1;\n"
" if (*p < 0) continue;\n"
" if ((*p > 0)) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'p' can be declared as pointer to const\n", errout.str());
check("void f() {\n"
" int val = 0;\n"
" int *p = &val;\n"
" if (*p < 0) continue;\n"
" if ((*p > 0)) {}\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison '*p < 0' is always false.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) The comparison '*p > 0' is always false.\n",
"[test.cpp:3]: (style) Variable 'p' can be declared as pointer to const\n",
errout.str());
check("void f() {\n"
" int val = 0;\n"
" if (val < 0) {\n"
" if ((val > 0)) {}\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'val < 0' is always false.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) The comparison 'val > 0' is always false.\n", errout.str());
check("void f() {\n"
" int val = 0;\n"
" if (val < 0) {\n"
" if ((val < 0)) {}\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The comparison 'val < 0' is always false.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) The comparison 'val < 0' is always false.\n", errout.str());
check("void f() {\n"
" int activate = 0;\n"
" int foo = 0;\n"
" if (activate) {}\n"
" else if (foo) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkSignOfUnsignedVariable() {
check("void foo() {\n"
" for(unsigned char i = 10; i >= 0; i--) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'i' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(bool b) {\n"
" for(unsigned int i = 10; b || i >= 0; i--) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'i' can't be negative so it is unnecessary to test it.\n", errout.str());
{
const char code[] = "void foo(unsigned int x) {\n"
" if (x < 0) {}\n"
"}";
check(code, nullptr, false, true, false);
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check(code, nullptr, false, true, true);
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
}
check("void foo(unsigned int x) {\n"
" if (x < 0u) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(int x) {\n"
" if (x < 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
{
const char code[] = "void foo(unsigned x) {\n"
" int y = 0;\n"
" if (x < y) {}\n"
"}";
check(code, nullptr, false, true, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check(code, nullptr, false, true, true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
}
check("void foo(unsigned x) {\n"
" int y = 0;\n"
" if (b)\n"
" y = 1;\n"
" if (x < y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x) {\n"
" if (0 > x) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(unsigned int x) {\n"
" if (0UL > x) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(int x) {\n"
" if (0 > x) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x) {\n"
" if (x >= 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(unsigned int x, unsigned y) {\n"
" if (x - y >= 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'x-y' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(unsigned int x) {\n"
" if (x >= 0ull) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(int x) {\n"
" if (x >= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x) {\n"
" if (0 <= x) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(unsigned int x) {\n"
" if (0ll <= x) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(int x) {\n"
" if (0 <= x) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (x < 0 && y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (x < 0 && y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (0 > x && y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (0 > x && y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (x >= 0 && y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (x >= 0 && y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (y && x < 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (y && x < 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (y && 0 > x) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (y && 0 > x) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (y && x >= 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (y && x >= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (x < 0 || y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (x < 0 || y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (0 > x || y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (0 > x || y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(unsigned int x, bool y) {\n"
" if (x >= 0 || y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned expression 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check("void foo(int x, bool y) {\n"
" if (x >= 0 || y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3233 - FP when template is used (template parameter is numeric constant)
{
const char code[] = "template<int n> void foo(unsigned int x) {\n"
" if (x <= n);\n"
"}\n"
"foo<0>();";
check(code, nullptr, false);
ASSERT_EQUALS("", errout.str());
check(code, nullptr, true);
ASSERT_EQUALS("", errout.str());
}
{
Settings s = settingsBuilder().checkUnusedTemplates().build();
check("template<int n> void foo(unsigned int x) {\n"
"if (x <= 0);\n"
"}", &s);
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned expression 'x' is less than zero.\n", errout.str());
}
// #8836
check("uint32_t value = 0xFUL;\n"
"void f() {\n"
" if (value < 0u)\n"
" {\n"
" value = 0u;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Checking if unsigned expression 'value' is less than zero.\n", errout.str());
// #9040
Settings settings1 = settingsBuilder().platform(Platform::Type::Win64).build();
check("using BOOL = unsigned;\n"
"int i;\n"
"bool f() {\n"
" return i >= 0;\n"
"}\n", &settings1);
ASSERT_EQUALS("", errout.str());
// #10612
check("void f(void) {\n"
" const uint32_t x = 0;\n"
" constexpr const auto y = 0xFFFFU;\n"
" if (y < x) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Checking if unsigned expression 'y' is less than zero.\n", errout.str());
}
void checkSignOfPointer() {
check("void foo(const int* x) {\n"
" if (x >= 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) A pointer can not be negative so it is either pointless or an error to check if it is not.\n", errout.str());
{
const char code[] = "void foo(const int* x) {\n"
" int y = 0;\n"
" if (x >= y) {}\n"
"}";
check(code, nullptr, false, true, false);
ASSERT_EQUALS("[test.cpp:3]: (style) A pointer can not be negative so it is either pointless or an error to check if it is not.\n", errout.str());
check(code, nullptr, false, true, true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) A pointer can not be negative so it is either pointless or an error to check if it is not.\n", errout.str());
}
check("void foo(const int* x) {\n"
" if (*x >= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const int* x) {\n"
" if (x < 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) A pointer can not be negative so it is either pointless or an error to check if it is.\n", errout.str());
{
const char code[] = "void foo(const int* x) {\n"
" unsigned y = 0u;\n"
" if (x < y) {}\n"
"}";
check(code, nullptr, false, true, false);
ASSERT_EQUALS("[test.cpp:3]: (style) A pointer can not be negative so it is either pointless or an error to check if it is.\n", errout.str());
check(code, nullptr, false, true, true);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) A pointer can not be negative so it is either pointless or an error to check if it is.\n", errout.str());
}
check("void foo(const int* x) {\n"
" if (*x < 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const int* x, const int* y) {\n"
" if (x - y < 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const int* x, const int* y) {\n"
" if (x - y <= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const int* x, const int* y) {\n"
" if (x - y > 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const int* x, const int* y) {\n"
" if (x - y >= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const Bar* x) {\n"
" if (0 <= x) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) A pointer can not be negative so it is either pointless or an error to check if it is not.\n", errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first) {\n"
" if (first.ptr >= 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) A pointer can not be negative so it is either pointless or an error to check if it is not.\n"
"[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n",
errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first, S* second) {\n"
" if((first.ptr - second.ptr) >= 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n"
"[test.cpp:4]: (style) Parameter 'second' can be declared as pointer to const\n",
errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first) {\n"
" if((first.ptr) >= 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) A pointer can not be negative so it is either pointless or an error to check if it is not.\n"
"[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n",
errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first, S* second) {\n"
" if(0 <= first.ptr - second.ptr) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n"
"[test.cpp:4]: (style) Parameter 'second' can be declared as pointer to const\n",
errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first, S* second) {\n"
" if(0 <= (first.ptr - second.ptr)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n"
"[test.cpp:4]: (style) Parameter 'second' can be declared as pointer to const\n",
errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first, S* second) {\n"
" if(first.ptr - second.ptr < 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n"
"[test.cpp:4]: (style) Parameter 'second' can be declared as pointer to const\n",
errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first, S* second) {\n"
" if((first.ptr - second.ptr) < 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n"
"[test.cpp:4]: (style) Parameter 'second' can be declared as pointer to const\n",
errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first, S* second) {\n"
" if(0 > first.ptr - second.ptr) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n"
"[test.cpp:4]: (style) Parameter 'second' can be declared as pointer to const\n",
errout.str());
check("struct S {\n"
" int* ptr;\n"
"};\n"
"void foo(S* first, S* second) {\n"
" if(0 > (first.ptr - second.ptr)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (style) Parameter 'first' can be declared as pointer to const\n"
"[test.cpp:4]: (style) Parameter 'second' can be declared as pointer to const\n",
errout.str());
check("void foo(const int* x) {\n"
" if (0 <= x[0]) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(Bar* x) {\n"
" if (0 <= x.y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'x' can be declared as pointer to const\n", errout.str());
check("void foo(Bar* x) {\n"
" if (0 <= x->y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'x' can be declared as pointer to const\n", errout.str());
check("void foo(Bar* x, Bar* y) {\n"
" if (0 <= x->y - y->y ) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'x' can be declared as pointer to const\n"
"[test.cpp:1]: (style) Parameter 'y' can be declared as pointer to const\n",
errout.str());
check("void foo(const Bar* x) {\n"
" if (0 > x) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) A pointer can not be negative so it is either pointless or an error to check if it is.\n", errout.str());
check("void foo(const int* x) {\n"
" if (0 > x[0]) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(Bar* x) {\n"
" if (0 > x.y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'x' can be declared as pointer to const\n", errout.str());
check("void foo(Bar* x) {\n"
" if (0 > x->y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'x' can be declared as pointer to const\n", errout.str());
check("void foo() {\n"
" int (*t)(void *a, void *b);\n"
" if (t(a, b) < 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" int (*t)(void *a, void *b);\n"
" if (0 > t(a, b)) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct object_info { int *typep; };\n"
"void packed_object_info(struct object_info *oi) {\n"
" if (oi->typep < 0);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) A pointer can not be negative so it is either pointless or an error to check if it is.\n"
"[test.cpp:2]: (style) Parameter 'oi' can be declared as pointer to const\n",
errout.str());
check("struct object_info { int typep[10]; };\n"
"void packed_object_info(struct object_info *oi) {\n"
" if (oi->typep < 0);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) A pointer can not be negative so it is either pointless or an error to check if it is.\n"
"[test.cpp:2]: (style) Parameter 'oi' can be declared as pointer to const\n",
errout.str());
check("struct object_info { int *typep; };\n"
"void packed_object_info(struct object_info *oi) {\n"
" if (*oi->typep < 0);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Parameter 'oi' can be declared as pointer to const\n", errout.str());
}
void checkSuspiciousSemicolon1() {
check("void foo() {\n"
" for(int i = 0; i < 10; ++i);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Empty block
check("void foo() {\n"
" for(int i = 0; i < 10; ++i); {\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious use of ; at the end of 'for' statement.\n", errout.str());
check("void foo() {\n"
" while (!quit); {\n"
" do_something();\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious use of ; at the end of 'while' statement.\n", errout.str());
}
void checkSuspiciousSemicolon2() {
check("void foo() {\n"
" if (i == 1); {\n"
" do_something();\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious use of ; at the end of 'if' statement.\n", errout.str());
// Seen this in the wild
check("void foo() {\n"
" if (Match());\n"
" do_something();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" if (Match());\n"
" else\n"
" do_something();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" if (i == 1)\n"
" ;\n"
" {\n"
" do_something();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" if (i == 1);\n"
"\n"
" {\n"
" do_something();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkSuspiciousSemicolon3() {
checkP("#define REQUIRE(code) {code}\n"
"void foo() {\n"
" if (x == 123);\n"
" REQUIRE(y=z);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkSuspiciousComparison() {
checkP("void f(int a, int b) {\n"
" a > b;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) Found suspicious operator '>', result is not used.\n", errout.str());
checkP("void f() {\n" // #10607
" for (auto p : m)\n"
" std::vector<std::pair<std::string, std::string>> k;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkInvalidFree() {
check("void foo(char *p) {\n"
" char *a; a = malloc(1024);\n"
" free(a + 10);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Mismatching address is freed. The address you get from malloc() must be freed without offset.\n", errout.str());
check("void foo(char *p) {\n"
" char *a; a = malloc(1024);\n"
" free(a - 10);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Mismatching address is freed. The address you get from malloc() must be freed without offset.\n", errout.str());
check("void foo(char *p) {\n"
" char *a; a = malloc(1024);\n"
" free(10 + a);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Mismatching address is freed. The address you get from malloc() must be freed without offset.\n", errout.str());
check("void foo(char *p) {\n"
" char *a; a = new char[1024];\n"
" delete[] (a + 10);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Mismatching address is deleted. The address you get from new must be deleted without offset.\n", errout.str());
check("void foo(char *p) {\n"
" char *a; a = new char;\n"
" delete a + 10;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Mismatching address is deleted. The address you get from new must be deleted without offset.\n", errout.str());
check("void foo(char *p) {\n"
" char *a; a = new char;\n"
" bar(a);\n"
" delete a + 10;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(char *p) {\n"
" char *a; a = new char;\n"
" char *b; b = new char;\n"
" bar(a);\n"
" delete a + 10;\n"
" delete b + 10;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Mismatching address is deleted. The address you get from new must be deleted without offset.\n", errout.str());
check("void foo(char *p) {\n"
" char *a; a = new char;\n"
" char *b; b = new char;\n"
" bar(a, b);\n"
" delete a + 10;\n"
" delete b + 10;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(char *p) {\n"
" char *a; a = new char;\n"
" bar()\n"
" delete a + 10;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Mismatching address is deleted. The address you get from new must be deleted without offset.\n", errout.str());
check("void foo(size_t xx) {\n"
" char *ptr; ptr = malloc(42);\n"
" ptr += xx;\n"
" free(ptr + 1 - xx);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Mismatching address is freed. The address you get from malloc() must be freed without offset.\n", errout.str());
check("void foo(size_t xx) {\n"
" char *ptr; ptr = malloc(42);\n"
" std::cout << ptr;\n"
" ptr = otherPtr;\n"
" free(otherPtr - xx - 1);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'ptr' can be declared as pointer to const\n", errout.str());
}
void checkRedundantCopy() {
check("const std::string& getA(){static std::string a;return a;}\n"
"void foo() {\n"
" const std::string a = getA();\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (performance, inconclusive) Use const reference for 'a' to avoid unnecessary data copying.\n", errout.str());
check("class A { public: A() {} char x[100]; };\n"
"const A& getA(){static A a;return a;}\n"
"int main()\n"
"{\n"
" const A a = getA();\n"
" return 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (performance, inconclusive) Use const reference for 'a' to avoid unnecessary data copying.\n", errout.str());
check("const int& getA(){static int a;return a;}\n"
"int main()\n"
"{\n"
" const int a = getA();\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("const int& getA(){static int a;return a;}\n"
"int main()\n"
"{\n"
" int getA = 0;\n"
" const int a = getA + 3;\n"
" return 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:4]: (style) Local variable \'getA\' shadows outer function\n", errout.str());
check("class A { public: A() {} char x[100]; };\n"
"const A& getA(){static A a;return a;}\n"
"int main()\n"
"{\n"
" const A a(getA());\n"
" return 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (performance, inconclusive) Use const reference for 'a' to avoid unnecessary data copying.\n", errout.str());
check("const int& getA(){static int a;return a;}\n"
"int main()\n"
"{\n"
" const int a(getA());\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class A{\n"
"public:A(int a=0){_a = a;}\n"
"A operator+(const A & a){return A(_a+a._a);}\n"
"private:int _a;};\n"
"const A& getA(){static A a;return a;}\n"
"int main()\n"
"{\n"
" const A a = getA() + 1;\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class A{\n"
"public:A(int a=0){_a = a;}\n"
"A operator+(const A & a){return A(_a+a._a);}\n"
"private:int _a;};\n"
"const A& getA(){static A a;return a;}\n"
"int main()\n"
"{\n"
" const A a(getA()+1);\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #5190 - FP when creating object with constructor that takes a reference
check("class A {};\n"
"class B { B(const A &a); };\n"
"const A &getA();\n"
"void f() {\n"
" const B b(getA());\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class A {};\n"
"class B { B(const A& a); };\n"
"const A& getA();\n"
"void f() {\n"
" const B b{ getA() };\n"
"}");
ASSERT_EQUALS("", errout.str());
// #5618
const char* code5618 = "class Token {\n"
"public:\n"
" const std::string& str();\n"
"};\n"
"void simplifyArrayAccessSyntax() {\n"
" for (Token *tok = list.front(); tok; tok = tok->next()) {\n"
" const std::string temp = tok->str();\n"
" tok->str(tok->strAt(2));\n"
" }\n"
"}";
check(code5618, nullptr, true);
ASSERT_EQUALS("", errout.str());
check(code5618, nullptr, false);
ASSERT_EQUALS("", errout.str());
// #5890 - crash: wesnoth desktop_util.cpp / unicode.hpp
check("typedef std::vector<char> X;\n"
"X f<X>(const X &in) {\n"
" const X s = f<X>(in);\n"
" return f<X>(s);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #7981 - False positive redundantCopyLocalConst - const ref argument to ctor
check("class CD {\n"
" public:\n"
" CD(const CD&);\n"
" static const CD& getOne();\n"
"};\n"
" \n"
"void foo() {\n"
" const CD cd(CD::getOne());\n"
"}", nullptr, true);
ASSERT_EQUALS("", errout.str());
check("struct S {\n" // #10545
" int modify();\n"
" const std::string& get() const;\n"
"};\n"
"std::string f(S& s) {\n"
" const std::string old = s.get();\n"
" int i = s.modify();\n"
" if (i != 0)\n"
" return old;\n"
" return {};\n"
"}", nullptr, /*inconclusive*/ true);
ASSERT_EQUALS("", errout.str());
check("struct X { int x; };\n" // #10191
"struct S {\n"
" X _x;\n"
" X& get() { return _x; }\n"
" void modify() { _x.x += 42; }\n"
" int copy() {\n"
" const X x = get();\n"
" modify();\n"
" return x.x;\n"
" }\n"
" int constref() {\n"
" const X& x = get();\n"
" modify();\n"
" return x.x;\n"
" }\n"
"};\n", nullptr, /*inconclusive*/ true);
ASSERT_EQUALS("", errout.str());
// #10704
check("struct C {\n"
" std::string str;\n"
" const std::string& get() const { return str; }\n"
"};\n"
"struct D {\n"
" C c;\n"
" bool f() const {\n"
" std::string s = c.get();\n"
" return s.empty();\n"
" }\n"
"};\n");
ASSERT_EQUALS("[test.cpp:8]: (performance, inconclusive) Use const reference for 's' to avoid unnecessary data copying.\n", errout.str());
check("struct C {\n"
" const std::string & get() const { return m; }\n"
" std::string m;\n"
"};\n"
"C getC();\n"
"void f() {\n"
" const std::string s = getC().get();\n"
"}\n"
"void g() {\n"
" std::string s = getC().get();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S {\n" // #12139
" int x, y;\n"
"};\n"
"struct T {\n"
" S s;\n"
" const S& get() const { return s; }\n"
"};\n"
"void f(const T& t) {\n"
" const S a = t.get();\n"
" if (a.x > a.y) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void checkNegativeShift() {
check("void foo()\n"
"{\n"
" int a; a = 123;\n"
" (void)(a << -1);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Shifting by a negative value is undefined behaviour\n", errout.str());
check("void foo()\n"
"{\n"
" int a; a = 123;\n"
" (void)(a >> -1);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Shifting by a negative value is undefined behaviour\n", errout.str());
check("void foo()\n"
"{\n"
" int a; a = 123;\n"
" a <<= -1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Shifting by a negative value is undefined behaviour\n", errout.str());
check("void foo()\n"
"{\n"
" int a; a = 123;\n"
" a >>= -1;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Shifting by a negative value is undefined behaviour\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << -1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << a << -1 ;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << 3 << -1 ;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" x = (-10+2) << 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (portability) Shifting a negative value is technically undefined behaviour\n", errout.str());
check("x = y ? z << $-1 : 0;");
ASSERT_EQUALS("", errout.str());
// Negative LHS
check("const int x = -1 >> 2;");
ASSERT_EQUALS("[test.cpp:1]: (portability) Shifting a negative value is technically undefined behaviour\n", errout.str());
// #6383 - unsigned type
check("const int x = (unsigned int)(-1) >> 2;");
ASSERT_EQUALS("", errout.str());
// #7814 - UB happening in valueflowcode when it tried to compute shifts.
check("int shift1() { return 1 >> -1 ;}\n"
"int shift2() { return 1 << -1 ;}\n"
"int shift3() { return -1 >> 1 ;}\n"
"int shift4() { return -1 << 1 ;}");
ASSERT_EQUALS("[test.cpp:1]: (error) Shifting by a negative value is undefined behaviour\n"
"[test.cpp:2]: (error) Shifting by a negative value is undefined behaviour\n"
"[test.cpp:3]: (portability) Shifting a negative value is technically undefined behaviour\n"
"[test.cpp:4]: (portability) Shifting a negative value is technically undefined behaviour\n", errout.str());
}
void incompleteArrayFill() {
check("void f() {\n"
" int a[5];\n"
" memset(a, 123, 5);\n"
" memcpy(a, b, 5);\n"
" memmove(a, b, 5);\n"
"}");
ASSERT_EQUALS(// TODO "[test.cpp:4] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n"
"[test.cpp:3]: (warning, inconclusive) Array 'a' is filled incompletely. Did you forget to multiply the size given to 'memset()' with 'sizeof(*a)'?\n"
"[test.cpp:4]: (warning, inconclusive) Array 'a' is filled incompletely. Did you forget to multiply the size given to 'memcpy()' with 'sizeof(*a)'?\n"
"[test.cpp:5]: (warning, inconclusive) Array 'a' is filled incompletely. Did you forget to multiply the size given to 'memmove()' with 'sizeof(*a)'?\n", errout.str());
check("int a[5];\n"
"namespace Z { struct B { int a[5]; } b; }\n"
"void f() {\n"
" memset(::a, 123, 5);\n"
" memset(Z::b.a, 123, 5);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:4]: (warning, inconclusive) Array '::a' is filled incompletely. Did you forget to multiply the size given to 'memset()' with 'sizeof(*::a)'?\n"
"[test.cpp:5]: (warning, inconclusive) Array 'Z::b.a' is filled incompletely. Did you forget to multiply the size given to 'memset()' with 'sizeof(*Z::b.a)'?\n",
"[test.cpp:4]: (warning, inconclusive) Array '::a' is filled incompletely. Did you forget to multiply the size given to 'memset()' with 'sizeof(*::a)'?\n", errout.str());
check("void f() {\n"
" Foo* a[5];\n"
" memset(a, 'a', 5);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Array 'a' is filled incompletely. Did you forget to multiply the size given to 'memset()' with 'sizeof(*a)'?\n", errout.str());
check("class Foo {int a; int b;};\n"
"void f() {\n"
" Foo a[5];\n"
" memset(a, 'a', 5);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning, inconclusive) Array 'a' is filled incompletely. Did you forget to multiply the size given to 'memset()' with 'sizeof(*a)'?\n", errout.str());
check("void f() {\n"
" Foo a[5];\n" // Size of foo is unknown
" memset(a, 'a', 5);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char a[5];\n"
" memset(a, 'a', 5);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a[5];\n"
" memset(a+15, 'a', 5);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" bool a[5];\n"
" memset(a, false, 5);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (portability, inconclusive) Array 'a' might be filled incompletely. Did you forget to multiply the size given to 'memset()' with 'sizeof(*a)'?\n", errout.str());
}
void redundantVarAssignment() {
setMultiline();
// Simple tests
check("void f(int i) {\n"
" i = 1;\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("test.cpp:3:style:Variable 'i' is reassigned a value before the old one has been used.\n"
"test.cpp:2:note:i is assigned\n"
"test.cpp:3:note:i is overwritten\n", errout.str());
// non-local variable => only show warning when inconclusive is used
check("int i;\n"
"void f() {\n"
" i = 1;\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable 'i' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:i is assigned\n"
"test.cpp:4:note:i is overwritten\n", errout.str());
check("void f() {\n"
" int i;\n"
" i = 1;\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable 'i' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:i is assigned\n"
"test.cpp:4:note:i is overwritten\n", errout.str());
check("void f() {\n"
" static int i;\n"
" i = 1;\n"
" i = 1;\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
check("void f() {\n"
" int i[10];\n"
" i[2] = 1;\n"
" i[2] = 1;\n"
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable 'i[2]' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:i[2] is assigned\n"
"test.cpp:4:note:i[2] is overwritten\n", errout.str());
check("void f(int x) {\n"
" int i[10];\n"
" i[x] = 1;\n"
" x=1;\n"
" i[x] = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(const int x) {\n"
" int i[10];\n"
" i[x] = 1;\n"
" i[x] = 1;\n"
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable 'i[x]' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:i[x] is assigned\n"
"test.cpp:4:note:i[x] is overwritten\n", errout.str());
// Testing different types
check("void f() {\n"
" Foo& bar = foo();\n"
" bar = x;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" Foo& bar = foo();\n"
" bar = x;\n"
" bar = y;\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
check("void f() {\n"
" Foo& bar = foo();\n" // #4425. bar might refer to something global, etc.
" bar = y();\n"
" foo();\n"
" bar = y();\n"
"}");
ASSERT_EQUALS("", errout.str());
// Tests with function call between assignment
check("void f(int i) {\n"
" i = 1;\n"
" bar();\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable 'i' is reassigned a value before the old one has been used.\n"
"test.cpp:2:note:i is assigned\n"
"test.cpp:4:note:i is overwritten\n", errout.str());
check("int i;\n"
"void f() {\n"
" i = 1;\n"
" bar();\n" // Global variable might be accessed in bar()
" i = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" static int i;\n"
" i = 1;\n"
" bar();\n" // bar() might call f() recursively. This could be a false positive in more complex examples (when value of i is used somewhere. See #4229)
" i = 2;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int i;\n"
" i = 1;\n"
" bar();\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("test.cpp:5:style:Variable 'i' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:i is assigned\n"
"test.cpp:5:note:i is overwritten\n", errout.str());
check("void bar(int i) {}\n"
"void f(int i) {\n"
" i = 1;\n"
" bar(i);\n" // Passed as argument
" i = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" Foo bar = foo();\n"
" bar();\n" // #5568. operator() called
" bar = y();\n"
"}");
ASSERT_EQUALS("", errout.str());
// Branch tests
check("void f(int i) {\n"
" i = 1;\n"
" if(x)\n"
" i = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int i) {\n"
" if(x)\n"
" i = 0;\n"
" i = 1;\n"
" i = 2;\n"
"}");
ASSERT_EQUALS("test.cpp:5:style:Variable 'i' is reassigned a value before the old one has been used.\n"
"test.cpp:4:note:i is assigned\n"
"test.cpp:5:note:i is overwritten\n", errout.str());
// #4513
check("int x;\n"
"int g() {\n"
" return x*x;\n"
"}\n"
"void f() {\n"
" x = 2;\n"
" x = g();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int g() {\n"
" return x*x;\n"
"}\n"
"void f(int x) {\n"
" x = 2;\n"
" x = g();\n"
"}");
ASSERT_EQUALS("test.cpp:6:style:Variable 'x' is reassigned a value before the old one has been used.\n"
"test.cpp:5:note:x is assigned\n"
"test.cpp:6:note:x is overwritten\n", errout.str());
check("void f() {\n"
" Foo& bar = foo();\n"
" bar = x;\n"
" bar = y();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class C {\n"
" int x;\n"
" void g() { return x * x; }\n"
" void f();\n"
"};\n"
"\n"
"void C::f() {\n"
" x = 2;\n"
" x = g();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class C {\n"
" int x;\n"
" void g() { return x*x; }\n"
" void f(Foo z);\n"
"};\n"
"\n"
"void C::f(Foo z) {\n"
" x = 2;\n"
" x = z.g();\n"
"}");
ASSERT_EQUALS("", errout.str());
// ({ })
check("void f() {\n"
" int x;\n"
" x = 321;\n"
" x = ({ asm(123); })\n"
"}");
ASSERT_EQUALS("", errout.str());
// from #3103 (avoid a false negative)
check("int foo(){\n"
" int x;\n"
" x = 1;\n"
" x = 1;\n"
" return x + 1;\n"
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable 'x' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:x is assigned\n"
"test.cpp:4:note:x is overwritten\n", errout.str());
// from #3103 (avoid a false positive)
check("int foo(){\n"
" int x;\n"
" x = 1;\n"
" if (y)\n" // <-- cppcheck does not know anything about 'y'
" x = 2;\n"
" return x + 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
// initialization, assignment with 0
check("void f() {\n" // Ticket #4356
" int x = 0;\n" // <- ignore initialization with 0
" x = 3;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" state_t *x = NULL;\n"
" x = dostuff();\n"
"}");
ASSERT_EQUALS("test.cpp:2:style:Variable 'x' can be declared as pointer to const\n", errout.str());
check("void f() {\n"
" state_t *x;\n"
" x = NULL;\n"
" x = dostuff();\n"
"}");
ASSERT_EQUALS("test.cpp:2:style:Variable 'x' can be declared as pointer to const\n", errout.str());
check("int foo() {\n" // #4420
" int x;\n"
" bar(++x);\n"
" x = 5;\n"
" return bar(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
// struct member..
check("struct AB { int a; int b; };\n"
"\n"
"int f() {\n"
" struct AB ab;\n"
" ab.a = 1;\n"
" ab.a = 2;\n"
" return ab.a;\n"
"}");
ASSERT_EQUALS("test.cpp:6:style:Variable 'ab.a' is reassigned a value before the old one has been used.\n"
"test.cpp:5:note:ab.a is assigned\n"
"test.cpp:6:note:ab.a is overwritten\n", errout.str());
check("struct AB { int a; int b; };\n"
"\n"
"int f() {\n"
" struct AB ab;\n"
" ab.a = 1;\n"
" ab = do_something();\n"
" return ab.a;\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
check("struct AB { int a; int b; };\n"
"\n"
"int f() {\n"
" struct AB ab;\n"
" ab.a = 1;\n"
" do_something(&ab);\n"
" ab.a = 2;\n"
" return ab.a;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct AB { int a; int b; };\n"
"\n"
"int f(DO_SOMETHING do_something) {\n"
" struct AB ab;\n"
" ab.a = 1;\n"
" do_something(&ab);\n"
" ab.a = 2;\n"
" return ab.a;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct AB { int a; int b; };\n"
"\n"
"int f(struct AB *ab) {\n"
" ab->a = 1;\n"
" ab->b = 2;\n"
" ab++;\n"
" ab->a = 1;\n"
" ab->b = 2;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct AB { int a; int b; };\n"
"\n"
"int f(struct AB *ab) {\n"
" ab->a = 1;\n"
" ab->b = 2;\n"
" ab = x;\n"
" ab->a = 1;\n"
" ab->b = 2;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(struct AB *ab) {\n" // #
" ab->data->x = 1;\n"
" ab = &ab1;\n"
" ab->data->x = 2;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #5964
check("void func(char *buffer, const char *format, int precision, unsigned value) {\n"
" (precision < 0) ? sprintf(buffer, format, value) : sprintf(buffer, format, precision, value);\n"
"}");
ASSERT_EQUALS("", errout.str());
// don't crash
check("struct data {\n"
" struct { int i; } fc;\n"
"};\n"
"struct state {\n"
" struct data d[123];\n"
"};\n"
"void func(struct state *s) {\n"
" s->foo[s->x++] = 2;\n"
" s->d[1].fc.i++;\n"
"}");
// #6525 - inline assembly
check("void f(int i) {\n"
" i = 1;\n"
" asm(\"foo\");\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #6555
check("void foo() {\n"
" char *p = 0;\n"
" try {\n"
" p = fred();\n"
" p = wilma();\n"
" }\n"
" catch (...) {\n"
" barney(p);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" char *p = 0;\n"
" try {\n"
" p = fred();\n"
" p = wilma();\n"
" }\n"
" catch (...) {\n"
" barney(x);\n"
" }\n"
"}");
ASSERT_EQUALS("test.cpp:2:style:The scope of the variable 'p' can be reduced.\n"
"test.cpp:2:style:Variable 'p' can be declared as pointer to const\n",
errout.str());
check("void foo() {\n"
" char *p = 0;\n"
" try {\n"
" if(z) {\n"
" p = fred();\n"
" p = wilma();\n"
" }\n"
" }\n"
" catch (...) {\n"
" barney(p);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// Member variable pointers
check("void podMemPtrs() {\n"
" int POD::*memptr;\n"
" memptr = &POD::a;\n"
" memptr = &POD::b;\n"
" if (memptr)\n"
" memptr = 0;\n"
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable 'memptr' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:memptr is assigned\n"
"test.cpp:4:note:memptr is overwritten\n", errout.str());
// Pointer function argument (#3857)
check("void f(float * var)\n"
"{\n"
" var[0] = 0.2f;\n"
" var[0] = 0.2f;\n" // <-- is initialized twice
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable 'var[0]' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:var[0] is assigned\n"
"test.cpp:4:note:var[0] is overwritten\n", errout.str());
check("void f(float * var)\n"
"{\n"
" *var = 0.2f;\n"
" *var = 0.2f;\n" // <-- is initialized twice
"}");
ASSERT_EQUALS("test.cpp:4:style:Variable '*var' is reassigned a value before the old one has been used.\n"
"test.cpp:3:note:*var is assigned\n"
"test.cpp:4:note:*var is overwritten\n", errout.str());
// Volatile variables
check("void f() {\n"
" volatile char *reg = (volatile char *)0x12345;\n"
" *reg = 12;\n"
" *reg = 34;\n"
"}");
ASSERT_EQUALS("test.cpp:2:style:C-style pointer casting\n", errout.str());
check("void f(std::map<int, int>& m, int key, int value) {\n" // #6379
" m[key] = value;\n"
" m[key] = value;\n"
"}\n");
ASSERT_EQUALS("test.cpp:3:style:Variable 'm[key]' is reassigned a value before the old one has been used.\n"
"test.cpp:2:note:m[key] is assigned\n"
"test.cpp:3:note:m[key] is overwritten\n",
errout.str());
}
void redundantVarAssignment_trivial() {
check("void f() {\n"
" int a = 0;\n"
" a = 4;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a;\n"
" a = 0;\n"
" a = 4;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" unsigned a;\n"
" a = 0u;\n"
" a = 2u;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" void* a;\n"
" a = (void*)0;\n"
" a = p;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'a' can be declared as pointer to const\n", errout.str());
check("void f() {\n"
" void* a;\n"
" a = (void*)0U;\n"
" a = p;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'a' can be declared as pointer to const\n", errout.str());
}
void redundantVarAssignment_struct() {
check("struct foo {\n"
" int a,b;\n"
"};\n"
"\n"
"int main() {\n"
" struct foo x;\n"
" x.a = _mm_set1_ps(1.0);\n"
" x.a = _mm_set1_ps(2.0);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:8]: (style) Variable 'x.a' is reassigned a value before the old one has been used.\n", errout.str());
check("void f() {\n"
" struct AB ab;\n"
" ab.x = 23;\n"
" ab.y = 41;\n"
" ab.x = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (style) Variable 'ab.x' is reassigned a value before the old one has been used.\n", errout.str());
check("void f() {\n"
" struct AB ab = {0};\n"
" ab = foo();\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void redundantVarAssignment_7133() {
// #7133
check("sal_Int32 impl_Export() {\n"
" try {\n"
" try {\n"
" uno::Sequence< uno::Any > aArgs(2);\n"
" beans::NamedValue aValue;\n"
" aValue.Name = \"DocumentHandler\";\n"
" aValue.Value <<= xDocHandler;\n"
" aArgs[0] <<= aValue;\n"
" aValue.Name = \"Model\";\n"
" aValue.Value <<= xDocumentComp;\n"
" aArgs[1] <<= aValue;\n"
" }\n"
" catch (const uno::Exception&) {\n"
" }\n"
" }\n"
" catch (const uno::Exception&) {\n"
" }\n"
"}", "test.cpp", true);
ASSERT_EQUALS("", errout.str());
check("void ConvertBitmapData(sal_uInt16 nDestBits) {\n"
" BitmapBuffer aSrcBuf;\n"
" aSrcBuf.mnBitCount = nSrcBits;\n"
" BitmapBuffer aDstBuf;\n"
" aSrcBuf.mnBitCount = nDestBits;\n"
" bConverted = ::ImplFastBitmapConversion( aDstBuf, aSrcBuf, aTwoRects );\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:3] -> [test.c:5]: (style) Variable 'aSrcBuf.mnBitCount' is reassigned a value before the old one has been used.\n", errout.str());
check("void ConvertBitmapData(sal_uInt16 nDestBits) {\n"
" BitmapBuffer aSrcBuf;\n"
" aSrcBuf.mnBitCount = nSrcBits;\n"
" BitmapBuffer aDstBuf;\n"
" aSrcBuf.mnBitCount = nDestBits;\n"
" bConverted = ::ImplFastBitmapConversion( aDstBuf, aSrcBuf, aTwoRects );\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (style) Variable 'aSrcBuf.mnBitCount' is reassigned a value before the old one has been used.\n",
errout.str());
check("class C { void operator=(int x); };\n" // #8368 - assignment operator might have side effects => inconclusive
"void f() {\n"
" C c;\n"
" c = x;\n"
" c = x;\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:5]: (style, inconclusive) Variable 'c' is reassigned a value before the old one has been used if variable is no semaphore variable.\n", errout.str());
}
void redundantVarAssignment_stackoverflow() {
check("typedef struct message_node {\n"
" char code;\n"
" size_t size;\n"
" struct message_node *next, *prev;\n"
"} *message_list;\n"
"static message_list remove_message_from_list(message_list m) {\n"
" m->prev->next = m->next;\n"
" m->next->prev = m->prev;\n"
" return m->next;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void redundantVarAssignment_lambda() {
// #7152
check("int foo() {\n"
" int x = 0, y = 0;\n"
" auto f = [&]() { if (x < 5) ++y; };\n"
" x = 2;\n"
" f();\n"
" x = 6;\n"
" f();\n"
" return y;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #10228
check("std::tuple<int, int> g();\n"
"void h(int);\n"
"void f() {\n"
" auto [a, b] = g();\n"
" auto l = [a = a]() { h(i); };\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void redundantVarAssignment_loop() {
check("void f() {\n"
" char buf[10];\n"
" int i;\n"
" for (i = 0; i < 4; i++)\n"
" buf[i] = 131;\n"
" buf[i] = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void bar() {\n" // #9262 do-while with break
" int x = 0;\n"
" x = 432;\n"
" do {\n"
" if (foo()) break;\n"
" x = 1;\n"
" } while (false);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int num) {\n" // #9420 FP
" int a = num;\n"
" for (int b = 0; b < num; a = b++)\n"
" dostuff(a);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int num) {\n" // #9420 FN
" int a = num;\n"
" for (int b = 0; b < num; a = b++);\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
}
void redundantVarAssignment_after_switch() {
check("void f(int x) {\n" // #7907
" int ret;\n"
" switch (x) {\n"
" case 123:\n"
" ret = 1;\n" // redundant assignment
" break;\n"
" }\n"
" ret = 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:8]: (style) Variable 'ret' is reassigned a value before the old one has been used.\n", errout.str());
}
void redundantVarAssignment_pointer() {
check("void f(int *ptr) {\n"
" int *x = ptr + 1;\n"
" *x = 23;\n"
" foo(ptr);\n"
" *x = 32;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #8997
check("void f() {\n"
" char x[2];\n"
" char* p = x;\n"
" *p = 1;\n"
" p += 1;\n"
" *p = 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void redundantVarAssignment_pointer_parameter() {
check("void f(int *p) {\n"
" *p = 1;\n"
" if (condition) return;\n"
" *p = 2;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void redundantVarAssignment_array() {
check("void f() {\n"
" int arr[10];\n"
" int i = 0;\n"
" arr[i] = 1;\n"
" i += 2;\n"
" arr[i] = 3;\n"
" dostuff(arr);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void redundantVarAssignment_switch_break() {
// #10058
check("void f(int a, int b) {\n"
" int ret = 0;\n"
" switch (a) {\n"
" case 1:\n"
" ret = 543;\n"
" if (b) break;\n"
" ret = 1;\n"
" break;\n"
" }"
" return ret;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int a, int b) {\n"
" int ret = 0;\n"
" switch (a) {\n"
" case 1:\n"
" ret = 543;\n"
" if (b) break;\n"
" ret = 1;\n"
" break;\n"
" }"
"}");
ASSERT_EQUALS("[test.cpp:5] -> [test.cpp:7]: (style) Variable 'ret' is reassigned a value before the old one has been used.\n", errout.str());
}
void redundantInitialization() {
setMultiline();
check("void f() {\n"
" int err = -ENOMEM;\n"
" err = dostuff();\n"
"}");
ASSERT_EQUALS("test.cpp:3:style:Redundant initialization for 'err'. The initialized value is overwritten before it is read.\n"
"test.cpp:2:note:err is initialized\n"
"test.cpp:3:note:err is overwritten\n",
errout.str());
check("void f() {\n"
" struct S s = {1,2,3};\n"
" s = dostuff();\n"
"}");
ASSERT_EQUALS("test.cpp:3:style:Redundant initialization for 's'. The initialized value is overwritten before it is read.\n"
"test.cpp:2:note:s is initialized\n"
"test.cpp:3:note:s is overwritten\n",
errout.str());
check("void f() {\n"
" int *p = NULL;\n"
" p = dostuff();\n"
"}");
ASSERT_EQUALS("test.cpp:2:style:Variable 'p' can be declared as pointer to const\n", errout.str());
// "trivial" initialization => do not warn
check("void f() {\n"
" struct S s = {0};\n"
" s = dostuff();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("namespace N { enum E {e0,e1}; }\n"
"void f() {\n"
" N::E e = N::e0;\n" // #9261
" e = dostuff();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #10143
" std::shared_ptr<int> i = g();\n"
" h();\n"
" i = nullptr;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f(const std::vector<int>& v) {\n" // #9815
" int i = g();\n"
" i = std::distance(v.begin(), std::find_if(v.begin(), v.end(), [=](int j) { return i == j; }));\n"
" return i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void redundantMemWrite() {
return; // FIXME: temporary hack
// Simple tests
// cppcheck-suppress unreachableCode - remove when code is enabled again
check("void f() {\n"
" char a[10];\n"
" memcpy(a, foo, bar);\n"
" memset(a, 0, bar);\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void f() {\n"
" char a[10];\n"
" strcpy(a, foo);\n"
" strncpy(a, 0, bar);\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void f() {\n"
" char a[10];\n"
" sprintf(a, \"foo\");\n"
" memmove(a, 0, bar);\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void f(char *filename) {\n"
" char *p = strrchr(filename,'.');\n"
" strcpy(p, \"foo\");\n"
" dostuff(filename);\n"
" strcpy(p, \"foo\");\n"
"}");
ASSERT_EQUALS("", errout.str());
// Writing to different parts of a buffer
check("void f(void* a) {\n"
" memcpy(a, foo, bar);\n"
" memset(a+5, 0, bar);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Use variable as second argument
check("void f(void* a, void* b) {\n"
" memset(a, 0, 5);\n"
" memcpy(b, a, 5);\n"
" memset(a, 1, 5);\n"
"}");
ASSERT_EQUALS("", errout.str());
// strcat is special
check("void f() {\n"
" char a[10];\n"
" strcpy(a, foo);\n"
" strcat(a, bar);\n" // Not redundant
" strcpy(a, x);\n" // Redundant
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
// Tests with function call between copy
check("void f() {\n"
" char a[10];\n"
" snprintf(a, foo, bar);\n"
" bar();\n"
" memset(a, 0, size);\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void* a;\n"
"void f() {\n"
" memset(a, 0, size);\n"
" bar();\n" // Global variable might be accessed in bar()
" memset(a, 0, size);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char a[10];\n"
" memset(a, 0, size);\n"
" bar();\n"
" memset(a, 0, size);\n"
"}");
TODO_ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (performance) Buffer 'a' is being written before its old content has been used.\n", "", errout.str());
check("void bar(void* a) {}\n"
"void f(void* a) {\n"
" memset(a, 0, size);\n"
" bar(a);\n" // Passed as argument
" memset(a, 0, size);\n"
"}");
ASSERT_EQUALS("", errout.str());
// Branch tests
check("void f(void* a) {\n"
" memset(a, 0, size);\n"
" if(x)\n"
" memset(a, 0, size);\n"
"}");
ASSERT_EQUALS("", errout.str());
// #4455 - initialization of local buffer
check("void f(void) {"
" char buf[10];\n"
" memset(buf, 0, 10);\n"
" strcpy(buf, string);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(void) {\n"
" char buf[10] = {0};\n"
" memset(buf, 0, 10);\n"
" strcpy(buf, string);\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) Buffer 'buf' is being written before its old content has been used.\n", errout.str());
// #5689 - use return value of strcpy
check("int f(void* a) {\n"
" int i = atoi(strcpy(a, foo));\n"
" strncpy(a, 0, bar);\n"
" return i;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #7175 - read+write
check("void f() {\n"
" char buf[100];\n"
" strcpy(buf, x);\n"
" strcpy(buf, dostuff(buf));\n" // <- read + write
" strcpy(buf, x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" char buf[100];\n"
" strcpy(buf, x);\n"
" strcpy(buf, dostuff(buf));\n"
" strcpy(buf, x);\n"
"}");
TODO_ASSERT_EQUALS("error", "", errout.str());
}
void varFuncNullUB() { // #4482
check("void a(...);\n"
"void b() { a(NULL); }");
ASSERT_EQUALS("[test.cpp:2]: (portability) Passing NULL after the last typed argument to a variadic function leads to undefined behaviour.\n", errout.str());
check("void a(char *p, ...);\n"
"void b() { a(NULL, 2); }");
ASSERT_EQUALS("", errout.str());
}
void checkCastIntToCharAndBack() { // #160
// check getchar
check("void f() {\n"
"unsigned char c; c = getchar();\n"
" while( c != EOF)\n"
" {\n"
" bar(c);\n"
" c = getchar();\n"
" } ;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Storing getchar() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f() {\n"
"unsigned char c = getchar();\n"
" while( EOF != c)\n"
" {\n"
" bar(c);\n"
" } ;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Storing getchar() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f() {\n"
" unsigned char c; c = getchar();\n"
" while( EOF != c )\n"
" {\n"
" bar(c);\n"
" c = getchar();\n"
" } ;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Storing getchar() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f() {\n"
" unsigned char c;\n"
" while( EOF != ( c = getchar() ) )\n"
" {\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Storing getchar() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f() {\n"
" int i; i = getchar();\n"
" while( i != EOF)\n"
" {\n"
" bar(i);\n"
" i = getchar();\n"
" } ;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int i; i = getchar();\n"
" while( EOF != i )\n"
" {\n"
" bar(i);\n"
" i = getchar();\n"
" } ;\n"
"}");
ASSERT_EQUALS("", errout.str());
// check getc
check("void f (FILE * pFile){\n"
"unsigned char c;\n"
"do {\n"
" c = getc (pFile);\n"
"} while (c != EOF)"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Storing getc() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f (FILE * pFile){\n"
"unsigned char c;\n"
"do {\n"
" c = getc (pFile);\n"
"} while (EOF != c)"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Storing getc() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f (FILE * pFile){\n"
"int i;\n"
"do {\n"
" i = getc (pFile);\n"
"} while (i != EOF)"
"}");
ASSERT_EQUALS("", errout.str());
check("void f (FILE * pFile){\n"
"int i;\n"
"do {\n"
" i = getc (pFile);\n"
"} while (EOF != i)"
"}");
ASSERT_EQUALS("", errout.str());
// check fgetc
check("void f (FILE * pFile){\n"
"unsigned char c;\n"
"do {\n"
" c = fgetc (pFile);\n"
"} while (c != EOF)"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Storing fgetc() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f (FILE * pFile){\n"
"char c;\n"
"do {\n"
" c = fgetc (pFile);\n"
"} while (EOF != c)"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Storing fgetc() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f (FILE * pFile){\n"
"signed char c;\n"
"do {\n"
" c = fgetc (pFile);\n"
"} while (EOF != c)"
"}");
ASSERT_EQUALS("", errout.str());
check("void f (FILE * pFile){\n"
"int i;\n"
"do {\n"
" i = fgetc (pFile);\n"
"} while (i != EOF)"
"}");
ASSERT_EQUALS("", errout.str());
check("void f (FILE * pFile){\n"
"int i;\n"
"do {\n"
" i = fgetc (pFile);\n"
"} while (EOF != i)"
"}");
ASSERT_EQUALS("", errout.str());
// cin.get()
check("void f(){\n"
" char ch; ch = std::cin.get();\n"
" while (EOF != ch) {\n"
" std::cout << ch;\n"
" ch = std::cin.get();\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Storing cin.get() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f(){\n"
" char ch; ch = std::cin.get();\n"
" while (ch != EOF) {\n"
" std::cout << ch;\n"
" ch = std::cin.get();\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Storing cin.get() return value in char variable and then comparing with EOF.\n", errout.str());
check("void f(){\n"
" int i; i = std::cin.get();\n"
" while ( EOF != i ) {\n"
" std::cout << i;\n"
" i = std::cin.get();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(){\n"
" int i; i = std::cin.get();\n"
" while ( i != EOF ) {\n"
" std::cout << i;\n"
" i = std::cin.get();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkCommaSeparatedReturn() {
check("int fun(int a) {\n"
" if (a < 0)\n"
" return a++,\n"
" do_something();\n"
"}", nullptr, false, false);
TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Comma is used in return statement. The comma can easily be misread as a ';'.\n", "", errout.str());
check("int fun(int a) {\n"
" if (a < 0)\n"
" return a++, do_something();\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("int fun(int a) {\n"
" if (a < 0)\n"
" return a+5,\n"
" do_something();\n"
"}", nullptr, false, false);
TODO_ASSERT_EQUALS("[test.cpp:3]: (style) Comma is used in return statement. The comma can easily be misread as a ';'.\n", "", errout.str());
check("int fun(int a) {\n"
" if (a < 0)\n"
" return a+5, do_something();\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
check("int fun(int a) {\n"
" if (a < 0)\n"
" return c<int,\nint>::b;\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
// #4943 take care of C++11 initializer lists
check("std::vector<Foo> Bar() {\n"
" return\n"
" {\n"
" { \"1\" },\n"
" { \"2\" },\n"
" { \"3\" }\n"
" };\n"
"}", nullptr, false, false);
ASSERT_EQUALS("", errout.str());
}
void checkPassByReference() {
// #8570 passByValue when std::move is used
check("struct A\n"
"{\n"
" std::vector<int> x;\n"
"};\n"
"\n"
"struct B\n"
"{\n"
" explicit B(A a) : a(std::move(a)) {}\n"
" void Init(A _a) { a = std::move(_a); }\n"
" A a;"
"};", nullptr, false, true);
ASSERT_EQUALS("", errout.str());
check("struct A\n"
"{\n"
" std::vector<int> x;\n"
"};\n"
"\n"
"struct B\n"
"{\n"
" explicit B(A a) : a{std::move(a)} {}\n"
" void Init(A _a) { a = std::move(_a); }\n"
" A a;"
"};", nullptr, false, true);
ASSERT_EQUALS("", errout.str());
check("struct A\n"
"{\n"
" std::vector<int> x;\n"
"};\n"
"\n"
"struct B\n"
"{\n"
" B(A a, A a2) : a{std::move(a)}, a2{std::move(a2)} {}\n"
" void Init(A _a) { a = std::move(_a); }\n"
" A a;"
" A a2;"
"};", nullptr, false, true);
ASSERT_EQUALS("", errout.str());
check("struct A\n"
"{\n"
" std::vector<int> x;\n"
"};\n"
"\n"
"struct B\n"
"{\n"
" B(A a, A a2) : a{std::move(a)}, a2{a2} {}\n"
" void Init(A _a) { a = std::move(_a); }\n"
" A a;"
" A a2;"
"};", nullptr, false, true);
ASSERT_EQUALS("[test.cpp:8]: (performance) Function parameter 'a2' should be passed by const reference.\n", errout.str());
check("struct A\n"
"{\n"
" std::vector<int> x;\n"
"};\n"
"\n"
"struct B\n"
"{\n"
" B(A a, A a2) : a{std::move(a)}, a2(a2) {}\n"
" void Init(A _a) { a = std::move(_a); }\n"
" A a;"
" A a2;"
"};", nullptr, false, true);
ASSERT_EQUALS("[test.cpp:8]: (performance) Function parameter 'a2' should be passed by const reference.\n", errout.str());
check("std::map<int, int> m;\n" // #10817
"void f(const decltype(m)::const_iterator i) {}");
ASSERT_EQUALS("", errout.str());
check("int (*pf) (std::vector<int>) = nullptr;\n" // #12118
"int f(std::vector<int> v) {\n"
" return v.size();\n"
"}\n"
"void g() {\n"
" pf = f;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:2]: (performance) Function parameter 'v' should be passed by const reference. However it seems that 'f' is a callback function.\n",
errout.str());
}
void checkComparisonFunctionIsAlwaysTrueOrFalse() {
// positive test
check("bool f(int x){\n"
" return isless(x,x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of two identical variables with isless(x,x) always evaluates to false.\n", errout.str());
check("bool f(int x){\n"
" return isgreater(x,x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of two identical variables with isgreater(x,x) always evaluates to false.\n", errout.str());
check("bool f(int x){\n"
" return islessgreater(x,x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of two identical variables with islessgreater(x,x) always evaluates to false.\n", errout.str());
check("bool f(int x){\n"
" return islessequal(x,x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of two identical variables with islessequal(x,x) always evaluates to true.\n", errout.str());
check("bool f(int x){\n"
" return isgreaterequal(x,x);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of two identical variables with isgreaterequal(x,x) always evaluates to true.\n", errout.str());
// no warning should be reported for
check("bool f(int x, int y){\n"
" return isgreaterequal(x,y) && islessequal(x,y) && islessgreater(x,y) && isgreater(x,y) && isless(x,y);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void integerOverflow() { // 5895
// no signed integer overflow should happen
check("void f(unsigned long long ull) {\n"
" if (ull == 0x89504e470d0a1a0a || ull == 0x8a4d4e470d0a1a0a) ;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void redundantPointerOp() {
check("int *f(int *x) {\n"
" return &*x;\n"
"}\n", nullptr, true);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant pointer operation on 'x' - it's already a pointer.\n", errout.str());
check("int *f(int *y) {\n"
" return &(*y);\n"
"}\n", nullptr, true);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant pointer operation on 'y' - it's already a pointer.\n", errout.str());
check("int f() {\n" // #10991
" int value = 4;\n"
" int result1 = *(&value);\n"
" int result2 = *&value;\n"
" return result1 + result2;\n"
"}\n", nullptr, true);
ASSERT_EQUALS("[test.cpp:3]: (style) Redundant pointer operation on 'value' - it's already a variable.\n"
"[test.cpp:4]: (style) Redundant pointer operation on 'value' - it's already a variable.\n",
errout.str());
check("void f(int& a, int b) {\n"
" *(&a) = b;\n"
"}\n", nullptr, true);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant pointer operation on 'a' - it's already a variable.\n",
errout.str());
check("void f(int**& p) {}\n", nullptr, true);
ASSERT_EQUALS("", errout.str());
checkP("#define RESTORE(ORIG, COPY) { *ORIG = *COPY; }\n"
"void f(int* p, int i) {\n"
" RESTORE(p, &i);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// no warning for bitwise AND
check("void f(const int *b) {\n"
" int x = 0x20 & *b;\n"
"}\n", nullptr, true);
ASSERT_EQUALS("", errout.str());
// No message for double pointers to structs
check("void f(struct foo **my_struct) {\n"
" char **pass_to_func = &(*my_struct)->buf;\n"
"}\n", nullptr, true);
ASSERT_EQUALS("", errout.str());
// another double pointer to struct - with an array
check("void f(struct foo **my_struct) {\n"
" char **pass_to_func = &(*my_struct)->buf[10];\n"
"}\n", nullptr, true);
ASSERT_EQUALS("", errout.str());
// double pointer to array
check("void f(char **ptr) {\n"
" int *x = &(*ptr)[10];\n"
"}\n", nullptr, true);
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'x' can be declared as pointer to const\n", errout.str());
// function calls
check("void f(Mutex *mut) {\n"
" pthread_mutex_lock(&*mut);\n"
"}\n", nullptr, false);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant pointer operation on 'mut' - it's already a pointer.\n", errout.str());
// make sure we got the AST match for "(" right
check("void f(char *ptr) {\n"
" if (&*ptr == NULL)\n"
" return;\n"
"}\n", nullptr, true);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant pointer operation on 'ptr' - it's already a pointer.\n", errout.str());
// no warning for macros
checkP("#define MUTEX_LOCK(m) pthread_mutex_lock(&(m))\n"
"void f(struct mutex *mut) {\n"
" MUTEX_LOCK(*mut);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkP("#define B(op) bar(op)\n"
"#define C(orf) B(&orf)\n"
"void foo(const int * pkey) {\n"
" C(*pkey);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void test_isSameExpression() { // see #5738
check("bool isInUnoIncludeFile(StringRef name) {"
" return name.startswith(SRCDIR \"/com/\") || name.startswith(SRCDIR \"/uno/\");\n"
"};", "test.cpp", false);
ASSERT_EQUALS("", errout.str());
}
void raceAfterInterlockedDecrement() {
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" whatever();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (counter)\n"
" return;\n"
" destroy();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (!counter)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (counter > 0)\n"
" return;\n"
" destroy();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (0 < counter)\n"
" return;\n"
" destroy();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (counter == 0)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (0 == counter)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (0 != counter)\n"
" return;\n"
" destroy()\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (counter != 0)\n"
" return;\n"
" destroy()\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (counter <= 0)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (0 >= counter)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (newCount)\n"
" return;\n"
" destroy();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (!newCount)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (newCount > 0)\n"
" return;\n"
" destroy();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (0 < newCount)\n"
" return;\n"
" destroy();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (newCount == 0)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (0 == newCount)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (0 != newCount)\n"
" return;\n"
" destroy()\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (newCount != 0)\n"
" return;\n"
" destroy()\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (newCount <= 0)\n"
" destroy();\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (0 >= newCount)\n"
" destroy;\n"
"}");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("int f() {\n"
" int counter = 0;\n"
" if (InterlockedDecrement(&counter) == 0) {\n"
" destroy();\n"
" return 0;\n"
" } else {\n"
" return counter;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("int f() {\n"
" int counter = 0;\n"
" if (::InterlockedDecrement(&counter) == 0) {\n"
" destroy();\n"
" return 0;\n"
" } else {\n"
" return counter;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("int f() {\n"
" int counter = 0;\n"
" if (InterlockedDecrement(&counter) == 0) {\n"
" destroy();\n"
" return 0;\n"
" }\n"
" return counter;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("int f() {\n"
" int counter = 0;\n"
" if (::InterlockedDecrement(&counter) == 0) {\n"
" destroy();\n"
" return 0;\n"
" }\n"
" return counter;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("int f() {\n"
" int counter = 0;\n"
" if (InterlockedDecrement(&counter) == 0) {\n"
" destroy();\n"
" return 0;\n"
" } else\n"
" return counter;\n"
" \n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
checkInterlockedDecrement("int f() {\n"
" int counter = 0;\n"
" if (::InterlockedDecrement(&counter) == 0) {\n"
" destroy();\n"
" return 0;\n"
" } else\n"
" return counter;\n"
" \n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Race condition: non-interlocked access after InterlockedDecrement(). Use InterlockedDecrement() return value instead.\n", errout.str());
}
void testUnusedLabel() {
check("void f() {\n"
" label:\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Label 'label' is not used.\n", errout.str());
check("void f() {\n"
" label:\n"
" foo();\n"
" goto label;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" label:\n"
" foo();\n"
" goto label;\n"
"}\n"
"void g() {\n"
" label:\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Label 'label' is not used.\n", errout.str());
check("void f() {\n"
" switch(a) {\n"
" default:\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" class X {\n"
" protected:\n"
" };\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" class X {\n"
" my_protected:\n"
" };\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int test(char art) {\n"
" switch (art) {\n"
" caseZERO:\n"
" return 0;\n"
" case1:\n"
" return 1;\n"
" case 2:\n"
" return 2;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Label 'caseZERO' is not used. Should this be a 'case' of the enclosing switch()?\n"
"[test.cpp:5]: (warning) Label 'case1' is not used. Should this be a 'case' of the enclosing switch()?\n", errout.str());
check("int test(char art) {\n"
" switch (art) {\n"
" case 2:\n"
" return 2;\n"
" }\n"
" label:\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (style) Label 'label' is not used.\n", errout.str());
}
void testEvaluationOrder() {
check("void f() {\n"
" int x = dostuff();\n"
" return x + x++;\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:3]: (error) Expression 'x+x++' depends on order of evaluation of side effects\n", errout.str());
// #7226
check("long int f1(const char *exp) {\n"
" return strtol(++exp, (char **)&exp, 10);\n"
"}", "test.c");
ASSERT_EQUALS("", errout.str());
check("long int f1(const char *exp) {\n"
" return dostuff(++exp, exp, 10);\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:2]: (error) Expression '++exp,exp' depends on order of evaluation of side effects\n", errout.str());
check("void f() {\n"
" int a;\n"
" while (a=x(), a==123) {}\n"
"}", "test.c");
ASSERT_EQUALS("", errout.str());
// # 8717
check("void f(int argc, char *const argv[]) {\n"
" char **local_argv = safe_malloc(sizeof (*local_argv));\n"
" int local_argc = 0;\n"
" local_argv[local_argc++] = argv[0];\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int x = 0;\n"
" return 0 + x++;\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" int a[10];\n"
" a[x+y] = a[y+x]++;;\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:3]: (error) Expression 'a[x+y]=a[y+x]++' depends on order of evaluation of side effects\n", errout.str());
}
void testEvaluationOrderSelfAssignment() {
// self assignment
check("void f() {\n"
" int x = x = y + 1;\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:2]: (warning) Redundant assignment of 'x' to itself.\n", errout.str());
}
void testEvaluationOrderMacro() {
// macro, don't bailout (#7233)
checkP("#define X x\n"
"void f(int x) {\n"
" return x + X++;\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:3]: (error) Expression 'x+x++' depends on order of evaluation of side effects\n", errout.str());
}
void testEvaluationOrderSequencePointsFunctionCall() {
// FP
check("void f(int id) {\n"
" id = dostuff(id += 42);\n"
"}", "test.c");
ASSERT_EQUALS("", errout.str());
// FN
check("void f(int id) {\n"
" id = id + dostuff(id += 42);\n"
"}", "test.c");
TODO_ASSERT_EQUALS("error", "", errout.str());
}
void testEvaluationOrderSequencePointsComma() {
check("int f(void) {\n"
" int t;\n"
" return (unsigned char)(t=1,t^c);\n"
"}", "test.c");
ASSERT_EQUALS("", errout.str());
check("void f(void) {\n"
" int t;\n"
" dostuff(t=1,t^c);\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:3]: (error) Expression 't=1,t^c' depends on order of evaluation of side effects\n", errout.str());
check("void f(void) {\n"
" int t;\n"
" dostuff((t=1,t),2);\n"
"}", "test.c");
ASSERT_EQUALS("", errout.str());
// #8230
check("void hprf(const char* fp) {\n"
" do\n"
" ;\n"
" while (++fp, (*fp) <= 0177);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
check("void hprf(const char* fp) {\n"
" do\n"
" ;\n"
" while (i++, ++fp, (*fp) <= 0177);\n"
"}\n", "test.c");
ASSERT_EQUALS("", errout.str());
check("void f(const char* fp) {\n"
" do\n"
" ;\n"
" while (f(++fp, (*fp) <= 7));\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:4]: (error) Expression '++fp,(*fp)<=7' depends on order of evaluation of side effects\n", errout.str());
}
void testEvaluationOrderSizeof() {
check("void f(char *buf) {\n"
" dostuff(buf++, sizeof(*buf));"
"}", "test.c");
ASSERT_EQUALS("", errout.str());
}
void testUnsignedLessThanZero() {
check("struct d {\n"
" unsigned n;\n"
"};\n"
"void f(void) {\n"
" struct d d;\n"
" d.n = 3;\n"
"\n"
" if (d.n < 0) {\n"
" return;\n"
" }\n"
"\n"
" if (0 > d.n) {\n"
" return;\n"
" }\n"
"}", "test.c");
ASSERT_EQUALS("[test.c:8]: (style) Checking if unsigned expression 'd.n' is less than zero.\n"
"[test.c:12]: (style) Checking if unsigned expression 'd.n' is less than zero.\n",
errout.str());
}
void doubleMove1() {
check("void g(A a);\n"
"void f() {\n"
" A a;\n"
" g(std::move(a));\n"
" g(std::move(a));\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Access of moved variable 'a'.\n", errout.str());
}
void doubleMoveMemberInitialization1() {
check("class A\n"
"{\n"
" A(B && b)\n"
" :b1(std::move(b))\n"
" {\n"
" b2 = std::move(b);\n"
" }\n"
" B b1;\n"
" B b2;\n"
"};");
ASSERT_EQUALS("[test.cpp:6]: (warning) Access of moved variable 'b'.\n", errout.str());
}
void doubleMoveMemberInitialization2() {
check("class A\n"
"{\n"
" A(B && b)\n"
" :b1(std::move(b)),\n"
" b2(std::move(b))\n"
" {}\n"
" B b1;\n"
" B b2;\n"
"};");
ASSERT_EQUALS("[test.cpp:5]: (warning) Access of moved variable 'b'.\n", errout.str());
}
void doubleMoveMemberInitialization3() { // #9974
check("struct A { int i; };\n"
"struct B { A a1; A a2; };\n"
"B f() {\n"
" A a1 = { 1 };\n"
" A a2 = { 2 };\n"
" return { .a1 = std::move(a1), .a2 = std::move(a2) };\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void doubleMoveMemberInitialization4() { // #11440
check("struct S { void f(int); };\n"
"struct T {\n"
" T(int c, S&& d) : c{ c }, d{ std::move(d) } { d.f(c); }\n"
" int c;\n"
" S d;\n"
"};\n");
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Access of moved variable 'd'.\n", errout.str());
}
void moveAndAssign1() {
check("A g(A a);\n"
"void f() {\n"
" A a;\n"
" a = g(std::move(a));\n"
" a = g(std::move(a));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void moveAndAssign2() {
check("A g(A a);\n"
"void f() {\n"
" A a;\n"
" B b = g(std::move(a));\n"
" C c = g(std::move(a));\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Access of moved variable 'a'.\n", errout.str());
}
void moveAssignMoveAssign() {
check("void h(A a);\n"
"void f() {"
" A a;\n"
" g(std::move(a));\n"
" h(a);\n"
" a = b;\n"
" h(a);\n"
" g(std::move(a));\n"
" h(a);\n"
" a = b;\n"
" h(a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Access of moved variable 'a'.\n"
"[test.cpp:8]: (warning) Access of moved variable 'a'.\n", errout.str());
}
void moveAndReset1() {
check("A g(A a);\n"
"void f() {\n"
" A a;\n"
" a.reset(g(std::move(a)));\n"
" a.reset(g(std::move(a)));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void moveAndReset2() {
check("A g(A a);\n"
"void f() {\n"
" A a;\n"
" A b;\n"
" A c;\n"
" b.reset(g(std::move(a)));\n"
" c.reset(g(std::move(a)));\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (warning) Access of moved variable 'a'.\n", errout.str());
}
void moveResetMoveReset() {
check("void h(A a);\n"
"void f() {"
" A a;\n"
" g(std::move(a));\n"
" h(a);\n"
" a.reset(b);\n"
" h(a);\n"
" g(std::move(a));\n"
" h(a);\n"
" a.reset(b);\n"
" h(a);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Access of moved variable 'a'.\n"
"[test.cpp:8]: (warning) Access of moved variable 'a'.\n", errout.str());
}
void moveAndFunctionParameter() {
check("void g(A a);\n"
"void f() {\n"
" A a;\n"
" A b = std::move(a);\n"
" g(a);\n"
" A c = a;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Access of moved variable 'a'.\n"
"[test.cpp:6]: (warning) Access of moved variable 'a'.\n", errout.str());
}
void moveAndFunctionParameterReference() {
check("void g(A & a);\n"
"void f() {\n"
" A a;\n"
" A b = std::move(a);\n"
" g(a);\n"
" A c = a;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void moveAndFunctionParameterConstReference() {
check("void g(A const & a);\n"
"void f() {\n"
" A a;\n"
" A b = std::move(a);\n"
" g(a);\n"
" A c = a;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (warning) Access of moved variable 'a'.\n"
"[test.cpp:6]: (warning) Access of moved variable 'a'.\n", errout.str());
}
void moveAndFunctionParameterUnknown() {
check("void f() {\n"
" A a;\n"
" A b = std::move(a);\n"
" g(a);\n"
" A c = a;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning, inconclusive) Access of moved variable 'a'.\n"
"[test.cpp:5]: (warning, inconclusive) Access of moved variable 'a'.\n", errout.str());
}
void moveAndReturn() {
check("int f(int i) {\n"
" A a;\n"
" A b;\n"
" g(std::move(a));\n"
" if (i)\n"
" return g(std::move(b));\n"
" return h(std::move(a),std::move(b));\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (warning) Access of moved variable 'a'.\n", errout.str());
}
void moveAndClear() {
check("void f() {\n"
" V v;\n"
" g(std::move(v));\n"
" v.clear();\n"
" if (v.empty()) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void movedPointer() {
check("void f() {\n"
" P p;\n"
" g(std::move(p));\n"
" x = p->x;\n"
" y = p->y;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Access of moved variable 'p'.\n"
"[test.cpp:5]: (warning) Access of moved variable 'p'.\n", errout.str());
}
void moveAndAddressOf() {
check("void f() {\n"
" std::string s1 = x;\n"
" std::string s2 = std::move(s1);\n"
" p = &s1;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void partiallyMoved() {
check("void f() {\n"
" A a;\n"
" gx(std::move(a).x());\n"
" gy(std::move(a).y());\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void moveAndLambda() {
check("void f() {\n"
" A a;\n"
" auto h = [a=std::move(a)](){return g(std::move(a));};"
" b = a;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void moveInLoop()
{
check("void g(std::string&& s);\n"
"void f() {\n"
" std::string p;\n"
" while(true)\n"
" g(std::move(p));\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (warning) Access of moved variable 'p'.\n", errout.str());
check("std::list<int> g(std::list<int>&&);\n"
"void f(std::list<int>l) {\n"
" for(int i = 0; i < 10; ++i) {\n"
" for (auto &j : g(std::move(l))) { (void)j; }\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (warning) Access of moved variable 'l'.\n", errout.str());
}
void moveCallback()
{
check("bool f(std::function<void()>&& callback);\n"
"void func(std::function<void()> callback) {\n"
" if(!f(std::move(callback)))\n"
" callback();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (warning) Access of moved variable 'callback'.\n", errout.str());
}
void moveClassVariable()
{
check("struct B {\n"
" virtual void f();\n"
"};\n"
"struct D : B {\n"
" void f() override {\n"
" auto p = std::unique_ptr<D>(new D(std::move(m)));\n"
" }\n"
" D(std::unique_ptr<int> c) : m(std::move(c)) {}\n"
" std::unique_ptr<int> m;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void forwardAndUsed() {
Settings s = settingsBuilder().checkUnusedTemplates().build();
check("template<typename T>\n"
"void f(T && t) {\n"
" g(std::forward<T>(t));\n"
" T s = t;\n"
"}", &s);
ASSERT_EQUALS("[test.cpp:4]: (warning) Access of forwarded variable 't'.\n", errout.str());
}
void moveAndReference() { // #9791
check("void g(std::string&&);\n"
"void h(const std::string&);\n"
"void f() {\n"
" std::string s;\n"
" const std::string& r = s;\n"
" g(std::move(s));\n"
" h(r);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (warning) Access of moved variable 'r'.\n", errout.str());
}
void moveForRange()
{
check("struct C {\n"
" void f() {\n"
" for (auto r : mCategory.find(std::move(mWhere))) {}\n"
" }\n"
" cif::category mCategory;\n"
" cif::condition mWhere;\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void funcArgNamesDifferent() {
check("void func1(int a, int b, int c);\n"
"void func1(int a, int b, int c) { }\n"
"void func2(int a, int b, int c);\n"
"void func2(int A, int B, int C) { }\n"
"class Fred {\n"
" void func1(int a, int b, int c);\n"
" void func2(int a, int b, int c);\n"
" void func3(int a = 0, int b = 0, int c = 0);\n"
" void func4(int a = 0, int b = 0, int c = 0);\n"
"};\n"
"void Fred::func1(int a, int b, int c) { }\n"
"void Fred::func2(int A, int B, int C) { }\n"
"void Fred::func3(int a, int b, int c) { }\n"
"void Fred::func4(int A, int B, int C) { }");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style, inconclusive) Function 'func2' argument 1 names different: declaration 'a' definition 'A'.\n"
"[test.cpp:3] -> [test.cpp:4]: (style, inconclusive) Function 'func2' argument 2 names different: declaration 'b' definition 'B'.\n"
"[test.cpp:3] -> [test.cpp:4]: (style, inconclusive) Function 'func2' argument 3 names different: declaration 'c' definition 'C'.\n"
"[test.cpp:7] -> [test.cpp:12]: (style, inconclusive) Function 'func2' argument 1 names different: declaration 'a' definition 'A'.\n"
"[test.cpp:7] -> [test.cpp:12]: (style, inconclusive) Function 'func2' argument 2 names different: declaration 'b' definition 'B'.\n"
"[test.cpp:7] -> [test.cpp:12]: (style, inconclusive) Function 'func2' argument 3 names different: declaration 'c' definition 'C'.\n"
"[test.cpp:9] -> [test.cpp:14]: (style, inconclusive) Function 'func4' argument 1 names different: declaration 'a' definition 'A'.\n"
"[test.cpp:9] -> [test.cpp:14]: (style, inconclusive) Function 'func4' argument 2 names different: declaration 'b' definition 'B'.\n"
"[test.cpp:9] -> [test.cpp:14]: (style, inconclusive) Function 'func4' argument 3 names different: declaration 'c' definition 'C'.\n", errout.str());
}
void funcArgOrderDifferent() {
check("void func1(int a, int b, int c);\n"
"void func1(int a, int b, int c) { }\n"
"void func2(int a, int b, int c);\n"
"void func2(int c, int b, int a) { }\n"
"void func3(int, int b, int c);\n"
"void func3(int c, int b, int a) { }\n"
"class Fred {\n"
" void func1(int a, int b, int c);\n"
" void func2(int a, int b, int c);\n"
" void func3(int a = 0, int b = 0, int c = 0);\n"
" void func4(int, int b = 0, int c = 0);\n"
"};\n"
"void Fred::func1(int a, int b, int c) { }\n"
"void Fred::func2(int c, int b, int a) { }\n"
"void Fred::func3(int c, int b, int a) { }\n"
"void Fred::func4(int c, int b, int a) { }\n",
nullptr, false);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (warning) Function 'func2' argument order different: declaration 'a, b, c' definition 'c, b, a'\n"
"[test.cpp:5] -> [test.cpp:6]: (warning) Function 'func3' argument order different: declaration ', b, c' definition 'c, b, a'\n"
"[test.cpp:9] -> [test.cpp:14]: (warning) Function 'func2' argument order different: declaration 'a, b, c' definition 'c, b, a'\n"
"[test.cpp:10] -> [test.cpp:15]: (warning) Function 'func3' argument order different: declaration 'a, b, c' definition 'c, b, a'\n"
"[test.cpp:11] -> [test.cpp:16]: (warning) Function 'func4' argument order different: declaration ', b, c' definition 'c, b, a'\n", errout.str());
}
// #7846 - Syntax error when using C++11 braced-initializer in default argument
void cpp11FunctionArgInit() {
// syntax error is not expected
ASSERT_NO_THROW(check("\n void foo(int declaration = {}) {"
"\n for (int i = 0; i < 10; i++) {}\n"
"\n }"
"\n "));
ASSERT_EQUALS("", errout.str());
}
void shadowVariables() {
check("int x;\n"
"void f() { int x; }");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:2]: (style) Local variable \'x\' shadows outer variable\n", errout.str());
check("int x();\n"
"void f() { int x; }");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:2]: (style) Local variable \'x\' shadows outer function\n", errout.str());
check("struct C {\n"
" C(int x) : x(x) {}\n" // <- we do not want a FP here
" int x;\n"
"};");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" if (cond) {int x;}\n" // <- not a shadow variable
" int x;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int size() {\n"
" int size;\n" // <- not a shadow variable
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n" // #8954 - lambda
" int x;\n"
" auto f = [](){ int x; }"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int x) { int x; }");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:1]: (style) Local variable 'x' shadows outer argument\n", errout.str());
check("class C { C(); void foo() { static int C = 0; } }"); // #9195 - shadow constructor
ASSERT_EQUALS("", errout.str());
check("struct C {\n" // #10091 - shadow destructor
" ~C();\n"
" void f() {\n"
" bool C{};\n"
" }\n"
"};\n"
"C::~C() = default;");
ASSERT_EQUALS("", errout.str());
// 10752 - no
check("struct S {\n"
" int i;\n"
"\n"
" static int foo() {\n"
" int i = 0;\n"
" return i;\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
check("struct S {\n"
" int i{};\n"
" void f() { int i; }\n"
"};\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Local variable 'i' shadows outer variable\n", errout.str());
check("struct S {\n"
" int i{};\n"
" std::vector<int> v;\n"
" void f() const { for (const int& i : v) {} }\n"
"};\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (style) Local variable 'i' shadows outer variable\n", errout.str());
check("struct S {\n" // #10405
" F* f{};\n"
" std::list<F> fl;\n"
" void S::f() const;\n"
"};\n"
"void S::f() const {\n"
" for (const F& f : fl) {}\n"
"};\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:7]: (style) Local variable 'f' shadows outer variable\n", errout.str());
check("extern int a;\n"
"int a;\n"
"static int f(void) {\n"
" int a;\n"
" return 0;\n"
"}\n", "test.c");
ASSERT_EQUALS("[test.c:1] -> [test.c:4]: (style) Local variable 'a' shadows outer variable\n", errout.str());
}
void knownArgument() {
check("void g(int);\n"
"void f(int x) {\n"
" g((x & 0x01) >> 7);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Argument '(x&0x01)>>7' to function g is always 0. It does not matter what value 'x' has.\n", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" g((int)((x & 0x01) >> 7));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Argument '(int)((x&0x01)>>7)' to function g is always 0. It does not matter what value 'x' has.\n", errout.str());
check("void g(int, int);\n"
"void f(int x) {\n"
" g(x, (x & 0x01) >> 7);\n"
"}");
ASSERT_EQUALS(
"[test.cpp:3]: (style) Argument '(x&0x01)>>7' to function g is always 0. It does not matter what value 'x' has.\n",
errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" g(0);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void h() { return 1; }\n"
"void f(int x) {\n"
" g(h());\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" g(std::strlen(\"a\"));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" g((int)0);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void g(Foo *);\n"
"void f() {\n"
" g(reinterpret_cast<Foo*>(0));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" x = 0;\n"
" g(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f() {\n"
" const int x = 0;\n"
" g(x + 1);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f() {\n"
" char i = 1;\n"
" g(static_cast<int>(i));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("char *yytext;\n"
"void re_init_scanner() {\n"
" int size = 256;\n"
" yytext = xmalloc(size * sizeof *yytext);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(const char *c) {\n"
" if (*c == '+' && (operand || !isalnum(*c))) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// #8986
check("void f(int);\n"
"void g() {\n"
" const int x[] = { 10, 10 };\n"
" f(x[0]);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int);\n"
"void g() {\n"
" int x[] = { 10, 10 };\n"
" f(x[0]);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'x' can be declared as const array\n", errout.str());
check("struct A { int x; };"
"void g(int);\n"
"void f(int x) {\n"
" A y;\n"
" y.x = 1;\n"
" g(y.x);\n"
"}");
ASSERT_EQUALS("", errout.str());
// allow known argument value in assert call
check("void g(int);\n"
"void f(int x) {\n"
" ASSERT((int)((x & 0x01) >> 7));\n"
"}");
ASSERT_EQUALS("", errout.str());
// #9905 - expression that does not use integer calculation at all
check("void foo() {\n"
" const std::string heading = \"Interval\";\n"
" std::cout << std::setw(heading.length());\n"
"}");
ASSERT_EQUALS("", errout.str());
// #9909 - struct member with known value
check("struct LongStack {\n"
" int maxsize;\n"
"};\n"
"\n"
"void growLongStack(LongStack* self) {\n"
" self->maxsize = 32;\n"
" dostuff(self->maxsize * sizeof(intptr_t));\n"
"}");
ASSERT_EQUALS("", errout.str());
// #11894
check("struct S {\n"
" int *p, n;\n"
"};\n"
"S* g() {\n"
" S* s = static_cast<S*>(calloc(1, sizeof(S)));\n"
" s->n = 100;\n"
" s->p = static_cast<int*>(malloc(s->n * sizeof(int)));\n"
" return s;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #11679
check("bool g(int);\n"
"void h(int);\n"
"int k(int a) { h(a); return 0; }\n"
"void f(int i) {\n"
" if (g(k(i))) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #11889
check("struct S {\n"
" int a[5];\n"
" void f(int i);\n"
"}\n"
"void g(int);\n"
"void S::f(int i) {\n"
" if (a[i] == 1) {\n"
" a[i] = 0;\n"
" g(a[i]);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #11927
check("void f(func_t func, int i) {\n"
" (func)(i, 0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { void operator()(int, int); };\n"
"void f(int i) {\n"
" S()(i, 1);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int& r) {\n"
" g(static_cast<char>(r = 42));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S { int i; };\n"
"void f(int i) {\n"
" const int a[] = { i - 1 * i, 0 };\n"
" auto s = S{ i - 1 * i };\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Argument 'i-1*i' to init list { is always 0. It does not matter what value 'i' has.\n"
"[test.cpp:4]: (style) Argument 'i-1*i' to constructor S is always 0. It does not matter what value 'i' has.\n",
errout.str());
}
void knownArgumentHiddenVariableExpression() {
// #9914 - variable expression is explicitly hidden
check("void f(int x) {\n"
" dostuff(x && false);\n"
" dostuff(false && x);\n"
" dostuff(x || true);\n"
" dostuff(true || x);\n"
" dostuff(x * 0);\n"
" dostuff(0 * x);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Argument 'false&&x' to function dostuff is always 0. Constant literal calculation disable/hide variable expression 'x'.\n"
"[test.cpp:5]: (style) Argument 'true||x' to function dostuff is always 1. Constant literal calculation disable/hide variable expression 'x'.\n"
"[test.cpp:6]: (style) Argument 'x*0' to function dostuff is always 0. Constant literal calculation disable/hide variable expression 'x'.\n"
"[test.cpp:7]: (style) Argument '0*x' to function dostuff is always 0. Constant literal calculation disable/hide variable expression 'x'.\n", errout.str());
}
void knownArgumentTernaryOperator() { // #10374
check("void f(bool a, bool b) {\n"
" const T* P = nullptr; \n"
" long N = 0; \n"
" const bool c = foo(); \n"
" bar(P, N); \n"
" if (c ? a : b)\n"
" baz(P, N); \n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkComparePointers() {
check("int f() {\n"
" const int foo[1] = {0};\n"
" const int bar[1] = {0};\n"
" int diff = 0;\n"
" if(foo > bar) {\n"
" diff = 1;\n"
" }\n"
" return diff;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2] -> [test.cpp:5] -> [test.cpp:3] -> [test.cpp:5] -> [test.cpp:5]: (error) Comparing pointers that point to different objects\n",
errout.str());
check("bool f() {\n"
" int x = 0;\n"
" int y = 0;\n"
" int* xp = &x;\n"
" int* yp = &y;\n"
" return xp > yp;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2] -> [test.cpp:4] -> [test.cpp:3] -> [test.cpp:5] -> [test.cpp:6]: (error) Comparing pointers that point to different objects\n"
"[test.cpp:4]: (style) Variable 'xp' can be declared as pointer to const\n"
"[test.cpp:5]: (style) Variable 'yp' can be declared as pointer to const\n",
errout.str());
check("bool f() {\n"
" int x = 0;\n"
" int y = 1;\n"
" return &x > &y;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2] -> [test.cpp:4] -> [test.cpp:3] -> [test.cpp:4] -> [test.cpp:4]: (error) Comparing pointers that point to different objects\n",
errout.str());
check("struct A {int data;};\n"
"bool f() {\n"
" A x;\n"
" A y;\n"
" int* xp = &x.data;\n"
" int* yp = &y.data;\n"
" return xp > yp;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:1] -> [test.cpp:5] -> [test.cpp:1] -> [test.cpp:6] -> [test.cpp:7]: (error) Comparing pointers that point to different objects\n"
"[test.cpp:5]: (style) Variable 'xp' can be declared as pointer to const\n"
"[test.cpp:6]: (style) Variable 'yp' can be declared as pointer to const\n",
errout.str());
check("struct A {int data;};\n"
"bool f(A ix, A iy) {\n"
" A* x = &ix;\n"
" A* y = &iy;\n"
" int* xp = &x->data;\n"
" int* yp = &y->data;\n"
" return xp > yp;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2] -> [test.cpp:3] -> [test.cpp:5] -> [test.cpp:2] -> [test.cpp:4] -> [test.cpp:6] -> [test.cpp:7]: (error) Comparing pointers that point to different objects\n"
"[test.cpp:5]: (style) Variable 'xp' can be declared as pointer to const\n"
"[test.cpp:6]: (style) Variable 'yp' can be declared as pointer to const\n",
errout.str());
check("bool f(int * xp, int* yp) {\n"
" return &xp > &yp;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:1] -> [test.cpp:2] -> [test.cpp:1] -> [test.cpp:2] -> [test.cpp:2]: (error) Comparing pointers that point to different objects\n",
errout.str());
check("int f() {\n"
" int x = 0;\n"
" int y = 1;\n"
" return &x - &y;\n"
"}");
ASSERT_EQUALS(
"[test.cpp:2] -> [test.cpp:4] -> [test.cpp:3] -> [test.cpp:4] -> [test.cpp:4]: (error) Subtracting pointers that point to different objects\n",
errout.str());
check("bool f() {\n"
" int x[2] = {1, 2}m;\n"
" int* xp = &x[0];\n"
" int* yp = &x[1];\n"
" return xp > yp;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (style) Variable 'xp' can be declared as pointer to const\n"
"[test.cpp:4]: (style) Variable 'yp' can be declared as pointer to const\n",
errout.str());
check("bool f(const int * xp, const int* yp) {\n"
" return xp > yp;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("bool f(const int & x, const int& y) {\n"
" return &x > &y;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int& g();\n"
"bool f() {\n"
" const int& x = g();\n"
" const int& y = g();\n"
" const int* xp = &x;\n"
" const int* yp = &y;\n"
" return xp > yp;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A {int data;};\n"
"bool f(A ix) {\n"
" A* x = &ix;\n"
" A* y = x;\n"
" int* xp = &x->data;\n"
" int* yp = &y->data;\n"
" return xp > yp;\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Variable 'xp' can be declared as pointer to const\n"
"[test.cpp:6]: (style) Variable 'yp' can be declared as pointer to const\n",
errout.str());
check("struct S { int i; };\n" // #11576
"int f(S s) {\n"
" return &s.i - (int*)&s;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) C-style pointer casting\n", errout.str());
check("struct S { int i; };\n"
"int f(S s1, S s2) {\n"
" return &s1.i - reinterpret_cast<int*>(&s2);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:3] -> [test.cpp:2] -> [test.cpp:3] -> [test.cpp:3]: (error) Subtracting pointers that point to different objects\n",
errout.str());
}
void unusedVariableValueTemplate() {
check("#include <functional>\n"
"class A\n"
"{\n"
"public:\n"
" class Hash\n"
" {\n"
" public:\n"
" std::size_t operator()(const A& a) const\n"
" {\n"
" (void)a;\n"
" return 0;\n"
" }\n"
" };\n"
"};\n"
"namespace std\n"
"{\n"
" template <>\n"
" struct hash<A>\n"
" {\n"
" std::size_t operator()(const A& a) const noexcept\n"
" {\n"
" return A::Hash{}(a);\n"
" }\n"
" };\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void moduloOfOne() {
check("void f(unsigned int x) {\n"
" int y = x % 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Modulo of one is always equal to zero\n", errout.str());
check("void f() {\n"
" for (int x = 1; x < 10; x++) {\n"
" int y = 100 % x;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int i, int j) {\n" // #11191
" const int c = pow(2, i);\n"
" if (j % c) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sameExpressionPointers() {
check("int f(int *i);\n"
"void g(int *a, const int *b) {\n"
" int c = *a;\n"
" f(a);\n"
" if (b && c != *a) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void checkOverlappingWrite() {
// union
check("void foo() {\n"
" union { int i; float f; } u;\n"
" u.i = 0;\n"
" u.i = u.f;\n" // <- error
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Overlapping read/write of union is undefined behavior\n", errout.str());
check("void foo() {\n" // #11013
" union { struct { uint8_t a; uint8_t b; }; uint16_t c; } u;\n"
" u.a = u.b = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
// memcpy
check("void foo() {\n"
" char a[10];\n"
" memcpy(&a[5], &a[4], 2u);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Overlapping read/write in memcpy() is undefined behavior\n", errout.str());
check("void foo() {\n"
" char a[10];\n"
" memcpy(a+5, a+4, 2u);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Overlapping read/write in memcpy() is undefined behavior\n", errout.str());
check("void foo() {\n"
" char a[10];\n"
" memcpy(a, a+1, 2u);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Overlapping read/write in memcpy() is undefined behavior\n", errout.str());
check("void foo() {\n"
" char a[8];\n"
" memcpy(&a[0], &a[4], 4u);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("_Bool a[10];\n" // #10350
"void foo() {\n"
" memcpy(&a[5], &a[4], 2u * sizeof(a[0]));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Overlapping read/write in memcpy() is undefined behavior\n", errout.str());
// wmemcpy
check("void foo() {\n"
" wchar_t a[10];\n"
" wmemcpy(&a[5], &a[4], 2u);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Overlapping read/write in wmemcpy() is undefined behavior\n", errout.str());
check("void foo() {\n"
" wchar_t a[10];\n"
" wmemcpy(a+5, a+4, 2u);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Overlapping read/write in wmemcpy() is undefined behavior\n", errout.str());
check("void foo() {\n"
" wchar_t a[10];\n"
" wmemcpy(a, a+1, 2u);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Overlapping read/write in wmemcpy() is undefined behavior\n", errout.str());
// strcpy
check("void foo(char *ptr) {\n"
" strcpy(ptr, ptr);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Overlapping read/write in strcpy() is undefined behavior\n", errout.str());
}
void constVariableArrayMember() { // #10371
check("class Foo {\n"
"public:\n"
" Foo();\n"
" int GetVal() const { return m_Arr[0]; }\n"
" int m_Arr[1];\n"
"};\n");
ASSERT_EQUALS("", errout.str());
}
void knownPointerToBool()
{
check("void g(bool);\n"
"void f() {\n"
" int i = 5;\n"
" int* p = &i;\n"
" g(p);\n"
" g(&i);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (style) Pointer expression 'p' converted to bool is always true.\n"
"[test.cpp:6]: (style) Pointer expression '&i' converted to bool is always true.\n",
errout.str());
check("void f() {\n"
" const int* x = nullptr;\n"
" std::empty(x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" const int* x = nullptr;\n"
" std::empty(const_cast<int*>(x));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct A { bool x; };\n"
"bool f(A* a) {\n"
" if (a) {\n"
" return a->x;\n"
" }\n"
" return false;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct A { int* x; };\n"
"bool f(A a) {\n"
" if (a.x) {\n"
" return a.x;\n"
" }\n"
" return false;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pointer expression 'a.x' converted to bool is always true.\n", errout.str());
check("void f(bool* b) { if (b) *b = true; }");
ASSERT_EQUALS("", errout.str());
check("bool f() {\n"
" int* x = nullptr;\n"
" return bool(x);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Pointer expression 'x' converted to bool is always false.\n", errout.str());
check("bool f() {\n"
" int* x = nullptr;\n"
" return bool{x};\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Pointer expression 'x' converted to bool is always false.\n", errout.str());
check("struct A { A(bool); };\n"
"A f() {\n"
" int* x = nullptr;\n"
" return A(x);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pointer expression 'x' converted to bool is always false.\n", errout.str());
check("struct A { A(bool); };\n"
"A f() {\n"
" int* x = nullptr;\n"
" return A{x};\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Pointer expression 'x' converted to bool is always false.\n", errout.str());
check("struct B { virtual void f() {} };\n" // #11929
"struct D : B {};\n"
"void g(B* b) {\n"
" if (!b)\n"
" return;\n"
" if (dynamic_cast<D*>(b)) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("bool (*ptr)();\n" // #12170
"void f() {\n"
" if (!ptr || !ptr()) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestOther)
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