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cppcheck/test/testother.cpp
Ken-Patrick Lehrmann eca7ee9260 9356: Prevent false positive when passing non-const reference to member constructor (#2370) 
* Add cases for 9356

* 9356: Prevent false positive when passing non-const reference to member constructor

This workarounds false positives 'Parameter  can be declared with const [constParameter]'
when said parameter is used in constructor call. It assume the
constructor call might change the parameter (without any checks.
The drawback is that we have false negative, in cases where we could
check the constructor actually takes a const reference, or a copied by
value parameter.

* Add todo comment in isVariableMutableInInitializer
2020-01-04 11:36:45 +01:00

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2019 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 "library.h"
#include "platform.h"
#include "settings.h"
#include "standards.h"
#include "testsuite.h"
#include "tokenize.h"
#include <simplecpp.h>
#include <tinyxml2.h>
#include <map>
#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(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(oldStylePointerCast);
TEST_CASE(invalidPointerCast);
TEST_CASE(passedByValue);
TEST_CASE(passedByValue_nonConst);
TEST_CASE(passedByValue_externC);
TEST_CASE(constVariable);
TEST_CASE(switchRedundantAssignmentTest);
TEST_CASE(switchRedundantOperationTest);
TEST_CASE(switchRedundantBitwiseOperationTest);
TEST_CASE(unreachableCode);
TEST_CASE(suspiciousCase);
TEST_CASE(suspiciousEqualityComparison);
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(testMisusedScopeObjectNoCodeAfter);
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(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(duplicateExpressionLoop);
TEST_CASE(duplicateValueTernary);
TEST_CASE(duplicateExpressionTernary); // #6391
TEST_CASE(duplicateExpressionTemplate); // #6930
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(checkForSuspiciousSemicolon1);
TEST_CASE(checkForSuspiciousSemicolon2);
TEST_CASE(checkInvalidFree);
TEST_CASE(checkRedundantCopy);
TEST_CASE(checkNegativeShift);
TEST_CASE(incompleteArrayFill);
TEST_CASE(redundantVarAssignment);
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(redundantInitialization);
TEST_CASE(redundantMemWrite);
TEST_CASE(varFuncNullUB);
TEST_CASE(checkPipeParameterSize); // ticket #3521
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(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(forwardAndUsed);
TEST_CASE(funcArgNamesDifferent);
TEST_CASE(funcArgOrderDifferent);
TEST_CASE(cpp11FunctionArgInit); // #7846 - "void foo(int declaration = {}) {"
TEST_CASE(shadowVariables);
TEST_CASE(constArgument);
TEST_CASE(checkComparePointers);
TEST_CASE(unusedVariableValueTemplate); // #8994
}
void check(const char code[], const char *filename = nullptr, bool experimental = false, bool inconclusive = true, bool runSimpleChecks=true, bool verbose=false, Settings* settings = nullptr) {
// Clear the error buffer..
errout.str("");
if (!settings) {
settings = &_settings;
}
settings->addEnabled("style");
settings->addEnabled("warning");
settings->addEnabled("portability");
settings->addEnabled("performance");
settings->standards.c = Standards::CLatest;
settings->standards.cpp = Standards::CPPLatest;
settings->inconclusive = inconclusive;
settings->experimental = experimental;
settings->verbose = verbose;
// Tokenize..
Tokenizer tokenizer(settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename ? filename : "test.cpp");
// Check..
CheckOther checkOther(&tokenizer, settings, this);
checkOther.runChecks(&tokenizer, settings, this);
(void)runSimpleChecks; // TODO Remove this
}
void check(const char code[], Settings *s) {
check(code,"test.cpp",false,true,true,false,s);
}
void checkP(const char code[], const char *filename = "test.cpp") {
// Clear the error buffer..
errout.str("");
Settings* settings = &_settings;
settings->addEnabled("style");
settings->addEnabled("warning");
settings->addEnabled("portability");
settings->addEnabled("performance");
settings->standards.c = Standards::CLatest;
settings->standards.cpp = Standards::CPPLatest;
settings->inconclusive = true;
settings->experimental = false;
// Raw tokens..
std::vector<std::string> files(1, filename);
std::istringstream istr(code);
const simplecpp::TokenList tokens1(istr, files, files[0]);
// Preprocess..
simplecpp::TokenList tokens2(files);
std::map<std::string, simplecpp::TokenList*> filedata;
simplecpp::preprocess(tokens2, tokens1, files, filedata, simplecpp::DUI());
// Tokenizer..
Tokenizer tokenizer(settings, this);
tokenizer.createTokens(&tokens2);
tokenizer.simplifyTokens1("");
// Check..
CheckOther checkOther(&tokenizer, settings, this);
checkOther.runChecks(&tokenizer, settings, this);
}
void checkposix(const char code[]) {
static Settings settings;
settings.addEnabled("warning");
settings.libraries.emplace_back("posix");
check(code,
nullptr, // filename
false, // experimental
false, // inconclusive
true, // runSimpleChecks
false, // verbose
&settings);
}
void checkInterlockedDecrement(const char code[]) {
static Settings settings;
settings.platformType = Settings::Win32A;
check(code, nullptr, false, 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"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (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"
"}");
TODO_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"
"}\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, 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"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void checkOldStylePointerCast(const char code[]) {
// Clear the error buffer..
errout.str("");
static Settings settings;
settings.addEnabled("style");
settings.standards.cpp = Standards::CPP03; // #5560
// Tokenize..
Tokenizer tokenizerCpp(&settings, this);
std::istringstream istr(code);
tokenizerCpp.tokenize(istr, "test.cpp");
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());
}
void checkInvalidPointerCast(const char code[], bool portability = true, bool inconclusive = false) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("warning");
if (portability)
settings.addEnabled("portability");
settings.inconclusive = inconclusive;
settings.defaultSign = 's';
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
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());
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());
}
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:2]: (style) Variable 's2' can be declared with 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(_settings);
s32.platform(cppcheck::Platform::Unix32);
check(code, &s32);
ASSERT_EQUALS("[test.cpp:5]: (performance) Function parameter 'x' should be passed by const reference.\n", errout.str());
Settings s64(_settings);
s64.platform(cppcheck::Platform::Unix64);
check(code, &s64);
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"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (style) Variable 'i' can be declared with const\n", errout.str());
check("int f(std::vector<int>& x) {\n"
" return x[0];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'x' can be declared with const\n", errout.str());
check("int f(std::vector<int> x) {\n"
" const int& i = x[0];\n"
" return i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f(std::vector<int> x) {\n"
" static int& i = x[0];\n"
" return i;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f(std::vector<int> x) {\n"
" int& i = x[0];\n"
" i++;\n"
" return i;\n"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f(const std::vector<int>& x) {\n"
" return x[0];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int& f(std::vector<int>& x) {\n"
" return x[0];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int f(std::vector<int>& x) {\n"
" x[0]++;\n"
" return x[0];\n"
"}\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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("template<class T>\n"
"T f(T& x) {\n"
" return x[0];\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("template<class T>\n"
"T f(T&& x) {\n"
" return x[0];\n"
"}\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); }\n");
ASSERT_EQUALS("", errout.str());
check("int f(int& x) {\n"
" return std::move(x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::ostream& os) {\n"
" os << \"Hello\";\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(int*);\n"
"void f(int& x) {\n"
" g(&x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct A { A(int*); };\n"
"A f(int& x) {\n"
" return A(&x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct A { A(int*); };\n"
"A f(int& x) {\n"
" return A{&x};\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Perhaps unused variable should be checked as well.
check("void f(int& x, int& y) {\n"
" y++;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" explicit A(int& y) : x(&y) {}\n"
" int * x = nullptr;\n"
"};\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"
"};\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int>& v) {\n"
" for(auto&& x:v)\n"
" x = 1;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int>& v) {\n"
" for(auto x:v)\n"
" x = 1;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'v' can be declared with const\n", errout.str());
check("void f(std::vector<int>& v) {\n"
" for(auto& x:v) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'v' can be declared with const\n", errout.str());
check("void f(std::vector<int>& v) {\n"
" for(const auto& x:v) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:1]: (style) Parameter 'v' can be declared with const\n", errout.str());
check("void f(int& i) {\n"
" int& j = i;\n"
" j++;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(std::vector<int>& v) {\n"
" int& i = v[0];\n"
" i++;\n"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" int& x;\n"
" A(int& y) : x(y)\n"
" {}\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"
"};\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("struct S {\n"
" int i;\n"
"};\n"
"int& f(S& s) {\n"
" return s.i;\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();\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&);\n"
"\n"
"private:\n"
" C c;\n"
"};\n"
"\n"
"D::D(int& i)\n"
" : c(i)\n"
"{\n"
"}\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"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:16]: (style) Parameter 'i' can be declared with 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"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:16]: (style) Parameter 'i' can be declared with 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"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:16]: (style) Parameter 'i' can be declared with 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]: (warning) 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]: (warning) 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]: (warning) 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]: (warning) 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, false);
// TODO ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:8]: (warning) 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]: (warning) 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, false);
// TODO ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:10]: (warning) 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, 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, 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, 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]: (warning) 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]: (warning) 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]: (warning) 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]: (warning) 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]: (warning) 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]: (warning) 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, 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]: (warning) 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]: (warning) 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, 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]: (warning) 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]: (warning) 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]: (warning) 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]: (warning) 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]: (warning) 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, 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, 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, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
Settings settings;
settings.library.setnoreturn("exit", true);
settings.library.functions["exit"].argumentChecks[1] = Library::ArgumentChecks();
check("void foo() {\n"
" exit(0);\n"
" break;\n"
"}", nullptr, false, 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, 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, false, &settings);
ASSERT_EQUALS("", errout.str());
check("void foo() { xResAccess->exit(); }", nullptr, false, 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, 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, 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, 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, false);
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" throw 0;\n"
" return;\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"
" 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, false);
ASSERT_EQUALS("[test.cpp:3]: (style) Statements following return, break, continue, goto or throw will never be executed.\n", errout.str());
check("int foo(int unused) {\n"
" return 0;\n"
" (void)unused;\n"
"}", nullptr, false, 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, 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, false);
ASSERT_EQUALS("[test.cpp:5]: (style) Statements following return, break, continue, goto or throw 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, 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, 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, false);
ASSERT_EQUALS("[test.cpp:7]: (style) Statements following return, break, continue, goto or throw will never be executed.\n", errout.str());
check("int foo() {\n"
" return 0;\n"
" label:\n"
" throw 0;\n"
"}", nullptr, false, 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, false);
ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
"\n" // #ifdef A
" return 0;\n"
"\n" // #endif
" return 1;\n"
"}", nullptr, false, 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,
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, 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, 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, false);
ASSERT_EQUALS("", errout.str());
// #6664
check("void foo() {\n"
" (beat < 100) ? (void)0 : exit(0);\n"
" bar();\n"
"}", nullptr, false, 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, false, &settings);
ASSERT_EQUALS("", errout.str());
// #8261
check("void foo() {\n"
" (beat < 100) ? (void)0 : throw(0);\n"
" bar();\n"
"}", nullptr, false, false, false, false, &settings);
ASSERT_EQUALS("", 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());
check("void foo() {\n"
" switch(a) {\n"
" case A&&B?B:A:\n"
" foo();\n"
" }\n"
"}");
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(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 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"
"}\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());
}
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"
"}\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, false);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickFunction1() {
check("int main ( )\n"
"{\n"
" CouldBeFunction ( 123 ) ;\n"
" return 0 ;\n"
"}\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"
"};\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectPicksClass() {
check("class NotAFunction ;\n"
"int function ( )\n"
"{\n"
" NotAFunction ( 123 );\n"
" return 0 ;\n"
"}\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"
"}\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"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void testMisusedScopeObjectDoesNotPickConstructorDeclaration() {
check("class Something : public SomethingElse\n"
"{\n"
"public:\n"
"~Something ( ) ;\n"
"Something ( ) ;\n"
"}\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"
"}\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"
"}\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"
"}\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());
}
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 testMisusedScopeObjectNoCodeAfter() {
check("class Foo {};\n"
"void f() {\n"
" Foo();\n" // No code after class => don't warn
"}", "test.cpp");
ASSERT_EQUALS("", errout.str());
}
void trac2084() {
check("void f()\n"
"{\n"
" struct sigaction sa;\n"
"\n"
" { sigaction(SIGHUP, &sa, 0); };\n"
" { sigaction(SIGINT, &sa, 0); };\n"
"}\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"
"}\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\", 1 + 1 ? 1 : 2);\n" // "1+1" is simplified away
"}",nullptr,false,false,false);
ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '+' and '?'.\n", errout.str());
check("void f() {\n"
" std::cout << x << 1 ? 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());
}
void clarifyStatement() {
check("char* f(char* c) {\n"
" *c++;\n"
" return c;\n"
"}");
ASSERT_EQUALS("[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) 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) 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) 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) 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) 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) 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("void *f(char* p) {\n"
" for (p = path; *p++;) ;\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, 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"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:5] -> [test.cpp:3]: (style, inconclusive) Found duplicate branches for 'if' and 'else'.\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"
"}\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 on both sides of '||'.\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, // experimental
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 with 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 expression '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 '&&'.\n", errout.str());
check("void f() {\n"
" enum { Four = 4 };\n"
" if (Four == 4) {}"
"}", nullptr, false, true, false);
ASSERT_EQUALS("", 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, false, true, false);
ASSERT_EQUALS("", 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, 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() {
Settings settings;
const 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>";
tinyxml2::XMLDocument doc;
doc.Parse(xmldata, sizeof(xmldata));
settings.library.load(doc);
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, 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"
"}\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, 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"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression '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"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression '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){}}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 1;\n"
" if ( a != 1){} \n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression 'a != 1' is always false.\n", errout.str());
check("void f() {\n"
" int a = 1;\n"
" int b = 1;\n"
" if ( a != b){} \n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3] -> [test.cpp:4]: (style) The expression '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"
"}\n");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) The expression '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"
"}\n");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:6]: (style) The expression '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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("const int a = 1;\n"
" void f() {\n"
" if ( a != 1){} \n"
"}\n");
ASSERT_EQUALS("[test.cpp:1] -> [test.cpp:3]: (style) The expression 'a != 1' is always false.\n", errout.str());
check("int a = 1;\n"
" void f() {\n"
" if ( a != 1){} \n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" static const int a = 1;\n"
" if ( a != 1){} \n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression 'a != 1' is always false.\n", errout.str());
check("void f() {\n"
" static int a = 1;\n"
" if ( a != 1){} \n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int a = 1;\n"
" if ( a != 1){\n"
" a++;\n"
" }}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression '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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("bool f(bool a, bool b) {\n"
" const bool c = a;\n"
" return a && b && c;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Same expression on both sides of '&&' 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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:5]: (style) The expression 'Diag == 0' is always true.\n", errout.str());
}
void duplicateExpression8() {
check("void f() {\n"
" int a = 1;\n"
" int b = a;\n"
" a = 2;\n"
" if ( b != a){}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int * a, int i) { int b = a[i]; a[i] = 2; if ( b != a[i]){}}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int * a, int i) { int b = *a; *a = 2; if ( b != *a){}}\n");
ASSERT_EQUALS("", errout.str());
check("struct A { int f() const; };\n"
"A g();\n"
"void foo() {\n"
" for (const A x = A();;) {\n"
" const int a = x.f();\n"
" x = g();\n"
" if (x.f() == a) break;\n"
" }\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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" const int a = {};\n"
" if(a == 1) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("volatile const int var = 42;\n"
"void f() { if(var == 42) {} }\n");
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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpressionLoop() {
check("void f() {\n"
" int a = 1;\n"
" while ( a != 1){}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression 'a != 1' is always false.\n", errout.str());
check("void f() { int a = 1; while ( a != 1){ a++; }}\n");
ASSERT_EQUALS("", errout.str());
check("void f() { int a = 1; for ( int i=0; i < 3 && a != 1; i++){ a++; }}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int b) { int a = 1; while (b) { if ( a != 1){} b++; } a++; } \n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" for(int i = 0; i < 10;) {\n"
" if( i != 0 ) {}\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression '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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" for(int i = 0; i < 10;) {\n"
" if( i != 0 ) { i++; }\n"
" i++;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" for(int i = 0; i < 10;) {\n"
" if( i != 0 ) { i++; }\n"
" }\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"
"}\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"
"}\n");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) The expression 'a != 1' is always false.\n", 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"
"}\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
check("void foo(bool flag) {\n"
" bar( (flag) ? ~0u : ~0ul);\n"
"}");
ASSERT_EQUALS((_settings.sizeof_int==_settings.sizeof_long)?"[test.cpp:2]: (style) Same value in both branches of ternary operator.\n":"", 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());
}
void duplicateExpressionTemplate() { // #6930
check("template <int I> void f() {\n"
" if (I >= 0 && I < 3) {}\n"
"}\n"
"\n"
"static auto a = f<0>();");
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"
"}\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(bool *a) {\n"
" const bool b = *a;\n"
" if( *a == !(b) ) {}\n"
" if( b == !(*a) ) {}\n"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" bool x = a;\n"
" dostuff();\n"
" if (x && a) {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" const bool b = g();\n"
" if (!b && g()) {}\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(int * p, 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", 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", 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(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());
// 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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("template <typename T>\n"
"T f() {\n"
" T x = T();\n"
"}\n"
"int &a = f<int&>();\n");
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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void multiConditionSameExpression() {
check("void f() {\n"
" int val = 0;\n"
" if (val < 0) continue;\n"
" if ((val > 0)) {}\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression 'val < 0' is always false.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) The expression '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"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression 'val < 0' is always false.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) The expression '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"
"}\n");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) The expression 'val < 0' is always false.\n"
"[test.cpp:2] -> [test.cpp:4]: (style) The expression '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"
"}\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, 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, 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, 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, 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, false);
ASSERT_EQUALS("", errout.str());
check(code, nullptr, false, true);
ASSERT_EQUALS("", errout.str());
}
check("template<int n> void foo(unsigned int x) {\n"
"if (x <= 0);\n"
"}\n");
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"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Checking if unsigned expression 'value' is less than zero.\n", errout.str());
// #9040
Settings settings1;
settings1.platform(Settings::Win64);
check("using BOOL = unsigned;\n"
"int i;\n"
"bool f() {\n"
" return i >= 0;\n"
"}\n", &settings1);
ASSERT_EQUALS("", errout.str());
}
void checkSignOfPointer() {
check("void foo(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(int* x) {\n"
" int y = 0;\n"
" if (x >= y) {}\n"
"}";
check(code, nullptr, false, 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, 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(int* x) {\n"
" if (*x >= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(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(int* x) {\n"
" unsigned y = 0u;\n"
" if (x < y) {}\n"
"}";
check(code, nullptr, false, 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, 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(int* x) {\n"
" if (*x < 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int* x, int* y) {\n"
" if (x - y < 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int* x, int* y) {\n"
" if (x - y <= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int* x, int* y) {\n"
" if (x - y > 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int* x, int* y) {\n"
" if (x - y >= 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(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", 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("", 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", 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("", 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("", 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("", 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("", 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("", 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("", errout.str());
check("void foo(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("", errout.str());
check("void foo(Bar* x) {\n"
" if (0 <= x->y) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(Bar* x, Bar* y) {\n"
" if (0 <= x->y - y->y ) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(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(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("", errout.str());
check("void foo(Bar* x) {\n"
" if (0 > x->y) {}\n"
"}");
ASSERT_EQUALS("", 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", 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", 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("", errout.str());
}
void checkForSuspiciousSemicolon1() {
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, inconclusive) 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, inconclusive) Suspicious use of ; at the end of 'while' statement.\n", errout.str());
}
void checkForSuspiciousSemicolon2() {
check("void foo() {\n"
" if (i == 1); {\n"
" do_something();\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning, inconclusive) 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 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("", 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(){}};\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(){}};\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());
// #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, false, true);
TODO_ASSERT_EQUALS("", "[test.cpp:7]: (performance, inconclusive) Use const reference for 'temp' to avoid unnecessary data copying.\n", errout.str());
check(code5618, nullptr, false, 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());
}
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;\n");
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 ;}\n");
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("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"
"}");
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", "", 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("", errout.str());
check("void f() {\n"
" state_t *x;\n"
" x = NULL;\n"
" x = dostuff();\n"
"}");
ASSERT_EQUALS("", 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",
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());
}
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", false, 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());
}
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 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("", 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());
}
void redundantMemWrite() {
return; // FIXME: temporary hack
// Simple tests
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 checkPipeParameterSize() { // #3521
checkposix("void f(){\n"
"int pipefd[1];\n" // <-- array of two integers is needed
"if (pipe(pipefd) == -1) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer 'pipefd' must have size of 2 integers if used as parameter of pipe().\n", errout.str());
checkposix("void f(){\n"
"int pipefd[2];\n"
"if (pipe(pipefd) == -1) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkposix("void f(){\n"
"int pipefd[20];\n"
"if (pipe(pipefd) == -1) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkposix("void f(){\n"
"int pipefd[1];\n" // <-- array of two integers is needed
"if (pipe2(pipefd,0) == -1) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer 'pipefd' must have size of 2 integers if used as parameter of pipe().\n", errout.str());
checkposix("void f(){\n"
"int pipefd[2];\n"
"if (pipe2(pipefd,0) == -1) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
checkposix("void f(){\n"
"int pipefd[20];\n"
"if (pipe2(pipefd,0) == -1) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// avoid crash with pointer variable
check("void foo (int* arrayPtr)\n"
"{\n"
" if (pipe (arrayPtr) < 0)\n"
" {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// avoid crash with pointer variable - for local variable on stack as well - see #4801
check("void foo() {\n"
" int *cp;\n"
" if ( pipe (cp) == -1 ) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// test with unknown variable
check("void foo() {\n"
" if ( pipe (cp) == -1 ) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// avoid crash with pointer variable - for local variable on stack as well - see #4801
check("void foo() {\n"
" int *cp;\n"
" if ( pipe (cp) == -1 ) {\n"
" return;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
// test with unknown variable
check("void foo() {\n"
" if ( pipe (cp) == -1 ) {\n"
" return;\n"
" }\n"
"}");
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, true, false, false);
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, true, false, false);
ASSERT_EQUALS("", errout.str());
check("int fun(int a) {\n"
" if (a < 0)\n"
" return a+5,\n"
" do_something();\n"
"}", nullptr, true, false, false);
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, true, false, false);
ASSERT_EQUALS("", errout.str());
check("int fun(int a) {\n"
" if (a < 0)\n"
" return c<int,\nint>::b;\n"
"}", nullptr, true, 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, true, 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, 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, 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, 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, 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, false, true);
ASSERT_EQUALS("[test.cpp:8]: (performance) Function parameter 'a2' should be passed by const reference.\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"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void redundantPointerOp() {
check("int *f(int *x) {\n"
" return &*x;\n"
"}\n", nullptr, false, 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, false, true);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant pointer operation on 'y' - it's already a pointer.\n", errout.str());
// no warning for bitwise AND
check("void f(int *b) {\n"
" int x = 0x20 & *b;\n"
"}\n", nullptr, false, 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, false, 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, false, true);
ASSERT_EQUALS("", errout.str());
// double pointer to array
check("void f(char **ptr) {\n"
" int *x = &(*ptr)[10];\n"
"}\n", nullptr, false, true);
ASSERT_EQUALS("", errout.str());
// function calls
check("void f(Mutex *mut) {\n"
" pthread_mutex_lock(&*mut);\n"
"}\n", nullptr, false, 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, false, true);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant pointer operation on 'ptr' - it's already a pointer.\n", errout.str());
// no warning for macros
check("#define MUTEX_LOCK(m) pthread_mutex_lock(&(m))\n"
"void f(struct mutex *mut) {\n"
" MUTEX_LOCK(*mut);\n"
"}\n", nullptr, false, true);
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, false);
ASSERT_EQUALS("", errout.str());
}
void raceAfterInterlockedDecrement() {
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" whatever();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" InterlockedDecrement(&counter);\n"
" if (counter)\n"
" return;\n"
" destroy();\n"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (!newCount)\n"
" destroy();\n"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (newCount == 0)\n"
" destroy();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (0 == newCount)\n"
" destroy();\n"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (newCount <= 0)\n"
" destroy();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
checkInterlockedDecrement("void f() {\n"
" int counter = 0;\n"
" int newCount = InterlockedDecrement(&counter);\n"
" if (0 >= newCount)\n"
" destroy;\n"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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"
"}\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 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 forwardAndUsed() {
check("template<typename T>\n"
"void f(T && t) {\n"
" g(std::forward<T>(t));\n"
" T s = t;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Access of forwarded variable 't'.\n", 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) { }\n");
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, 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; }\n");
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; }\n");
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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("int size() {\n"
" int size;\n" // <- not a shadow variable
"}\n");
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());
}
void constArgument() {
check("void g(int);\n"
"void f(int x) {\n"
" g((x & 0x01) >> 7);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Argument '(x&1)>>7' to function g is always 0\n", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" g((int)((x & 0x01) >> 7));\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Argument '(int)((x&1)>>7)' to function g is always 0\n", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" g(0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void h() { return 1; }\n"
"void f(int x) {\n"
" g(h());\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" g(std::strlen(\"a\"));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" g((int)0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(Foo *);\n"
"void f() {\n"
" g(reinterpret_cast<Foo*>(0));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f(int x) {\n"
" x = 0;\n"
" g(x);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f() {\n"
" const int x = 0;\n"
" g(x + 1);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void g(int);\n"
"void f() {\n"
" char i = 1;\n"
" g(static_cast<int>(i));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// #8986
check("void f(int);\n"
"void g() {\n"
" const int x[] = { 10, 10 };\n"
" f(x[0]);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int);\n"
"void g() {\n"
" int x[] = { 10, 10 };\n"
" f(x[0]);\n"
"}\n");
ASSERT_EQUALS("", 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"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void checkComparePointers() {
check("int f() {\n"
" int foo[1] = {0};\n"
" int bar[1] = {0};\n"
" int diff = 0;\n"
" if(foo > bar) {\n"
" diff = 1;\n"
" }\n"
" return diff;\n"
"}\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"
"}\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",
errout.str());
check("bool f() {\n"
" int x = 0;\n"
" int y = 1;\n"
" return &x > &y;\n"
"}\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"
"}\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",
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"
"}\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",
errout.str());
check("bool f(int * xp, int* yp) {\n"
" return &xp > &yp;\n"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", errout.str());
check("bool f(int * xp, int* yp) {\n"
" return xp > yp;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("bool f(const int & x, const int& y) {\n"
" return &x > &y;\n"
"}\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"
"}\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"
"}\n");
ASSERT_EQUALS("", 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());
}
};
REGISTER_TEST(TestOther)
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