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cppcheck/test/testother.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2018 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(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(oldStylePointerCast);
TEST_CASE(invalidPointerCast);
TEST_CASE(passedByValue);
TEST_CASE(passedByValue_nonConst);
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(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_for);
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);
}
void check(const char code[], const char *filename = nullptr, bool experimental = false, bool inconclusive = true, bool runSimpleChecks=true, Settings* settings = 0) {
// 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;
// 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);
if (runSimpleChecks) {
tokenizer.simplifyTokenList2();
checkOther.runSimplifiedChecks(&tokenizer, settings, this);
}
}
void check(const char code[], Settings *s) {
check(code,"test.cpp",false,true,true,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);
tokenizer.simplifyTokenList2();
checkOther.runSimplifiedChecks(&tokenizer, settings, this);
}
void checkposix(const char code[]) {
static Settings settings;
settings.addEnabled("warning");
settings.standards.posix = true;
check(code,
nullptr, // filename
false, // experimental
false, // inconclusive
true, // runSimpleChecks
&settings);
}
void checkInterlockedDecrement(const char code[]) {
static Settings settings;
settings.platformType = Settings::Win32A;
check(code, nullptr, false, false, true, &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 zeroDivCond() {
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x > 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (warning) Either the condition 'x>0' is redundant or there is division by zero at line 2.\n", errout.str());
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x >= 1) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (warning) Either the condition 'x>=1' is redundant or there is division by zero at line 2.\n", errout.str());
check("void f(int x) {\n"
" int y = 17 / x;\n"
" if (x == 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (warning) Either the condition 'x==0' is redundant or there is division by zero at line 2.\n", errout.str());
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (warning) Either the condition 'x!=0' is redundant or there is division by zero at line 2.\n", errout.str());
// function call
check("void f1(int x, int y) { c=x/y; }\n"
"void f2(unsigned int y) {\n"
" f1(123,y);\n"
" if (y>0){}\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:1]: (warning) Either the condition 'y>0' is redundant or there is division by zero at line 1.\n", errout.str());
// avoid false positives when variable is changed after division
check("void f() {\n"
" unsigned int x = do_something();\n"
" int y = 17 / x;\n"
" x = some+calculation;\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
{
// function is called that might modify global variable
check("void do_something();\n"
"int x;\n"
"void f() {\n"
" int y = 17 / x;\n"
" do_something();\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// function is called. but don't care, variable is local
check("void do_something();\n"
"void f() {\n"
" int x = some + calculation;\n"
" int y = 17 / x;\n"
" do_something();\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:6] -> [test.cpp:4]: (warning) Either the condition 'x!=0' is redundant or there is division by zero at line 4.\n", errout.str());
}
check("void do_something(int value);\n"
"void f(int x) {\n"
" int y = 17 / x;\n"
" do_something(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int x;\n"
"void f() {\n"
" int y = 17 / x;\n"
" while (y || x == 0) { x--; }\n"
"}");
ASSERT_EQUALS("", errout.str());
// ticket 5033 segmentation fault (valid code) in CheckOther::checkZeroDivisionOrUselessCondition
check("void f() {\n"
"double* p1= new double[1];\n"
"double* p2= new double[1];\n"
"double* p3= new double[1];\n"
"double* pp[3] = {p1,p2,p3};\n"
"}");
ASSERT_EQUALS("", errout.str());
// #5105 - FP
check("int f(int a, int b) {\n"
" int r = a / b;\n"
" if (func(b)) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
// Unknown types for b and c --> do not warn
check("int f(int d) {\n"
" int r = (a?b:c) / d;\n"
" if (d == 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(int a) {\n"
" int r = a ? 1 / a : 0;\n"
" if (a == 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f(int a) {\n"
" int r = (a == 0) ? 0 : 1 / a;\n"
" if (a == 0) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
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 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;
// 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"
"}");
TODO_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",
"[test.cpp:3]: (portability) Casting between float* and 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 integer* and long double* which have an incompatible binary data representation.\n"
"[test.cpp:3]: (portability) Casting between integer* and double* which have an incompatible binary data representation.\n"
"[test.cpp:4]: (portability) Casting between integer* 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 integer* 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 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 integer* 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("", 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 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"
"}", 0, 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"
" 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;\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());
}
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 |= 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, &settings);
ASSERT_EQUALS("[test.cpp:3]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("class NeonSession {\n"
" void exit();\n"
"};\n"
"void NeonSession::exit()\n"
"{\n"
" SAL_INFO(\"ucb.ucp.webdav\", \"neon commands cannot be aborted\");\n"
"}", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
check("void NeonSession::exit()\n"
"{\n"
" SAL_INFO(\"ucb.ucp.webdav\", \"neon commands cannot be aborted\");\n"
"}", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
check("void foo() { xResAccess->exit(); }", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
check("void foo(int a)\n"
"{\n"
" switch(a) {\n"
" case 0:\n"
" printf(\"case 0\");\n"
" break;\n"
" break;\n"
" case 1:\n"
" c++;\n"
" break;\n"
" }\n"
"}", nullptr, false, false, 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("void foo() {\n"
" wxCHECK2(state < 3 && state >= 0, return);\n"
" _checkboxState = state;\n"
"}");
ASSERT_EQUALS("", 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){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"
" __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, &settings);
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" (beat < 100) ? exit(0) : (void)0;\n"
" bar();\n"
"}", nullptr, false, false, false, &settings);
ASSERT_EQUALS("", errout.str());
// #8261
check("void foo() {\n"
" (beat < 100) ? (void)0 : throw(0);\n"
" bar();\n"
"}", nullptr, 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 (c == 1) 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) *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 x) {\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());
// #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
"}",0,false,false,false);
TODO_ASSERT_EQUALS("[test.cpp:2]: (style) Clarify calculation precedence for '+' and '?'.\n", "", errout.str()); // TODO: Is that really necessary, or is this pattern too unlikely?
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) Ineffective statement similar to '*A++;'. 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) Ineffective statement similar to '*A++;'. Did you intend to write '(*A)++;'?\n", errout.str());
check("void f(Foo f) {\n"
" *f.a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Ineffective statement similar to '*A++;'. 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) Ineffective statement similar to '*A++;'. 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) Ineffective statement similar to '*A++;'. 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) Ineffective statement similar to '*A++;'. 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) Ineffective statement similar to '*A++;'. 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
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("", 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, &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());
}
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 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--)"
" printf(\"%u\", i);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned variable '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--)"
" printf(\"%u\", i);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned variable 'i' can't be negative so it is unnecessary to test it.\n", errout.str());
check(
"bool foo(unsigned int x) {\n"
" if (x < 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check(
"bool foo(int x) {\n"
" if (x < 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x) {\n"
" if (0 > x)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check(
"bool foo(int x) {\n"
" if (0 > x)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x) {\n"
" if (x >= 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned variable 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check(
"bool foo(int x) {\n"
" if (x >= 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (x < 0 && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (x < 0 && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (0 > x && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (0 > x && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (x >= 0 && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned variable 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (x >= 0 && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (y && x < 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (y && x < 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (y && 0 > x)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (y && 0 > x)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (y && x >= 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned variable 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (y && x >= 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (x < 0 || y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (x < 0 || y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (0 > x || y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Checking if unsigned variable 'x' is less than zero.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (0 > x || y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(unsigned int x, bool y) {\n"
" if (x >= 0 || y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Unsigned variable 'x' can't be negative so it is unnecessary to test it.\n", errout.str());
check(
"bool foo(int x, bool y) {\n"
" if (x >= 0 || y)"
" return true;\n"
" return false;\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("[test.cpp:2]: (style, inconclusive) Checking if unsigned variable 'x' is less than zero. This might be a false warning.\n", errout.str());
}
}
void checkSignOfPointer() {
check(
"bool foo(int* x) {\n"
" if (x >= 0)"
" bar();\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(
"bool foo(int* x) {\n"
" if (*x >= 0)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(int* x) {\n"
" if (x < 0)"
" bar();\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(
"bool foo(int* x) {\n"
" if (*x < 0)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(int* x, int* y) {\n"
" if (x - y < 0)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(int* x, int* y) {\n"
" if (x - y <= 0)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(int* x, int* y) {\n"
" if (x - y > 0)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(int* x, int* y) {\n"
" if (x - y >= 0)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(Bar* x) {\n"
" if (0 <= x)"
" bar();\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(
"bool foo(int* x) {\n"
" if (0 <= x[0])"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(Bar* x) {\n"
" if (0 <= x.y)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(Bar* x) {\n"
" if (0 <= x->y)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(Bar* x, Bar* y) {\n"
" if (0 <= x->y - y->y )"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(Bar* x) {\n"
" if (0 > x)"
" bar();\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(
"bool foo(int* x) {\n"
" if (0 > x[0])"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(Bar* x) {\n"
" if (0 > x.y)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"bool foo(Bar* x) {\n"
" if (0 > x->y)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo() {\n"
" int (*t)(void *a, void *b);\n"
" if (t(a, b) < 0)\n"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo() {\n"
" int (*t)(void *a, void *b);\n"
" if (0 > t(a, b))\n"
" bar();\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) Invalid memory address freed.\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) Invalid memory address freed.\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) Invalid memory address freed.\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) Invalid memory address freed.\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) Invalid memory address freed.\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) Invalid memory address freed.\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) Invalid memory address freed.\n", errout.str());
check(
"void foo(size_t xx) {\n"
" char *ptr; ptr = malloc(42);\n"
" ptr += xx;\n"
" free(ptr - xx - 1);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error, inconclusive) Invalid memory address freed.\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"
" 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"
" 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() {
// Simple tests
check("void f(int i) {\n"
" i = 1;\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (style) Variable 'i' is reassigned a value before the old one has been used.\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:3] -> [test.cpp:4]: (style) Variable 'i' is reassigned a value before the old one has been used.\n", errout.str());
check("void f() {\n"
" int i;\n"
" i = 1;\n"
" i = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (style) Variable 'i' is reassigned a value before the old one has been used.\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:3] -> [test.cpp:4]: (style) Variable 'i[2]' is reassigned a value before the old one has been used.\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:3] -> [test.cpp:4]: (style) Variable 'i[x]' is reassigned a value before the old one has been used.\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:2] -> [test.cpp:4]: (style) Variable 'i' is reassigned a value before the old one has been used.\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:3] -> [test.cpp:5]: (style) Variable 'i' is reassigned a value before the old one has been used.\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:4] -> [test.cpp:5]: (style) Variable 'i' is reassigned a value before the old one has been used.\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:5] -> [test.cpp:6]: (style) Variable 'x' is reassigned a value before the old one has been used.\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());
// 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:3] -> [test.cpp:4]: (style) Variable 'x' is reassigned a value before the old one has been used.\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:5] -> [test.cpp:6]: (style) Variable 'ab.a' is reassigned a value before the old one has been used.\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:3] -> [test.cpp:4]: (style) Variable 'memptr' is reassigned a value before the old one has been used.\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());
}
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_for() {
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());
}
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"
" 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 variable 'd.n' is less than zero.\n"
"[test.c:12]: (style) Checking if unsigned variable '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 "
));
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());
}
};
REGISTER_TEST(TestOther)
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