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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2025 Cppcheck team.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "checkother.h"
#include "errortypes.h"
#include "fixture.h"
#include "helpers.h"
#include "platform.h"
#include "settings.h"
#include "standards.h"
#include <cstddef>
#include <sstream>
#include <string>
static std::string unionZeroInitMessage(int lno, int cno, const std::string &varName, const std::string &largestMemberName)
{
std::stringstream ss;
ss << "[test.cpp:" << lno << ":" << cno << "]: (portability) ";
ss << "Zero initializing union '" << varName << "' ";
ss << "does not guarantee its complete storage to be zero initialized as its largest member is not declared as the first member. ";
ss << "Consider making " << largestMemberName << " the first member or favor memset(). [UnionZeroInit]";
ss << std::endl;
return ss.str();
}
class TestOther : public TestFixture {
public:
TestOther() : TestFixture("TestOther") {}
private:
const Settings settings0 = settingsBuilder().library("std.cfg").build();
/*const*/ Settings settings1 = settingsBuilder().library("std.cfg").severity(Severity::style).severity(Severity::warning).severity(Severity::portability).severity(Severity::performance).build();
const Settings settings2 = settingsBuilder(settings1).certainty(Certainty::inconclusive).build();
void run() override {
mNewTemplate = true;
TEST_CASE(emptyBrackets);
TEST_CASE(zeroDiv1);
TEST_CASE(zeroDiv2);
TEST_CASE(zeroDiv3);
TEST_CASE(zeroDiv4);
TEST_CASE(zeroDiv5);
TEST_CASE(zeroDiv6);
TEST_CASE(zeroDiv7); // #4930
TEST_CASE(zeroDiv8);
TEST_CASE(zeroDiv9);
TEST_CASE(zeroDiv10);
TEST_CASE(zeroDiv11);
TEST_CASE(zeroDiv12);
TEST_CASE(zeroDiv13);
TEST_CASE(zeroDiv14); // #1169
TEST_CASE(zeroDiv15); // #8319
TEST_CASE(zeroDiv16); // #11158
TEST_CASE(zeroDiv17); // #9931
TEST_CASE(zeroDiv18);
TEST_CASE(zeroDiv19);
TEST_CASE(zeroDiv20); // #11175
TEST_CASE(zeroDiv21);
TEST_CASE(zeroDiv22);
TEST_CASE(zeroDivCond); // division by zero / useless condition
TEST_CASE(nanInArithmeticExpression);
TEST_CASE(varScope1);
TEST_CASE(varScope2);
TEST_CASE(varScope3);
TEST_CASE(varScope4);
TEST_CASE(varScope5);
TEST_CASE(varScope6);
TEST_CASE(varScope7);
TEST_CASE(varScope8);
TEST_CASE(varScope9); // classes may have extra side-effects
TEST_CASE(varScope10); // Undefined macro FOR
TEST_CASE(varScope11); // #2475 - struct initialization is not inner scope
TEST_CASE(varScope12);
TEST_CASE(varScope13); // variable usage in inner loop
TEST_CASE(varScope14);
TEST_CASE(varScope15); // #4573 if-else-if
TEST_CASE(varScope16);
TEST_CASE(varScope17);
TEST_CASE(varScope18);
TEST_CASE(varScope20); // Ticket #5103
TEST_CASE(varScope21); // Ticket #5382
TEST_CASE(varScope22); // Ticket #5684
TEST_CASE(varScope23); // Ticket #6154
TEST_CASE(varScope24); // pointer / reference
TEST_CASE(varScope25); // time_t
TEST_CASE(varScope26); // range for loop, map
TEST_CASE(varScope27); // #7733 - #if
TEST_CASE(varScope28); // #10527
TEST_CASE(varScope29); // #10888
TEST_CASE(varScope30); // #8541
TEST_CASE(varScope31); // #11099
TEST_CASE(varScope32); // #11441
TEST_CASE(varScope33);
TEST_CASE(varScope34);
TEST_CASE(varScope35);
TEST_CASE(varScope36); // #12158
TEST_CASE(varScope37); // #12158
TEST_CASE(varScope38);
TEST_CASE(varScope39);
TEST_CASE(varScope40);
TEST_CASE(varScope41); // #11845
TEST_CASE(varScope42);
TEST_CASE(varScope43);
TEST_CASE(varScope44);
TEST_CASE(varScope45);
TEST_CASE(varScope46);
TEST_CASE(oldStylePointerCast);
TEST_CASE(intToPointerCast);
TEST_CASE(invalidPointerCast);
TEST_CASE(passedByValue);
TEST_CASE(passedByValue_nonConst);
TEST_CASE(passedByValue_externC);
TEST_CASE(constVariable);
TEST_CASE(constParameterCallback);
TEST_CASE(constPointer);
TEST_CASE(constArray);
TEST_CASE(switchRedundantAssignmentTest);
TEST_CASE(switchRedundantOperationTest);
TEST_CASE(switchRedundantBitwiseOperationTest);
TEST_CASE(unreachableCode);
TEST_CASE(redundantContinue);
TEST_CASE(suspiciousCase);
TEST_CASE(suspiciousEqualityComparison);
TEST_CASE(suspiciousUnaryPlusMinus); // #8004
TEST_CASE(suspiciousFloatingPointCast);
TEST_CASE(selfAssignment);
TEST_CASE(trac1132);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunction1);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunction2);
TEST_CASE(testMisusedScopeObjectPicksClass);
TEST_CASE(testMisusedScopeObjectPicksStruct);
TEST_CASE(testMisusedScopeObjectDoesNotPickIf);
TEST_CASE(testMisusedScopeObjectDoesNotPickConstructorDeclaration);
TEST_CASE(testMisusedScopeObjectDoesNotPickFunctor);
TEST_CASE(testMisusedScopeObjectDoesNotPickLocalClassConstructors);
TEST_CASE(testMisusedScopeObjectDoesNotPickUsedObject);
TEST_CASE(testMisusedScopeObjectDoesNotPickPureC);
TEST_CASE(testMisusedScopeObjectDoesNotPickNestedClass);
TEST_CASE(testMisusedScopeObjectInConstructor);
TEST_CASE(testMisusedScopeObjectStandardType);
TEST_CASE(testMisusedScopeObjectNamespace);
TEST_CASE(testMisusedScopeObjectAssignment); // #11371
TEST_CASE(trac2071);
TEST_CASE(trac2084);
TEST_CASE(trac3693);
TEST_CASE(clarifyCalculation);
TEST_CASE(clarifyStatement);
TEST_CASE(duplicateBranch);
TEST_CASE(duplicateBranch1); // tests extracted by http://www.viva64.com/en/b/0149/ ( Comparison between PVS-Studio and cppcheck ): Errors detected in Quake 3: Arena by PVS-Studio: Fragment 2
TEST_CASE(duplicateBranch2); // empty macro
TEST_CASE(duplicateBranch3);
TEST_CASE(duplicateBranch4);
TEST_CASE(duplicateBranch5); // make sure the Token attributes are compared
TEST_CASE(duplicateBranch6);
TEST_CASE(duplicateExpression1);
TEST_CASE(duplicateExpression2); // ticket #2730
TEST_CASE(duplicateExpression3); // ticket #3317
TEST_CASE(duplicateExpression4); // ticket #3354 (++)
TEST_CASE(duplicateExpression5); // ticket #3749 (macros with same values)
TEST_CASE(duplicateExpression6); // ticket #4639
TEST_CASE(duplicateExpression7);
TEST_CASE(duplicateExpression8);
TEST_CASE(duplicateExpression9); // #9320
TEST_CASE(duplicateExpression10); // #9485
TEST_CASE(duplicateExpression11); // #8916 (function call)
TEST_CASE(duplicateExpression12); // #10026
TEST_CASE(duplicateExpression13); // #7899
TEST_CASE(duplicateExpression14); // #9871
TEST_CASE(duplicateExpression15); // #10650
TEST_CASE(duplicateExpression16); // #10569
TEST_CASE(duplicateExpression17); // #12036
TEST_CASE(duplicateExpression18);
TEST_CASE(duplicateExpression19);
TEST_CASE(duplicateExpression20);
TEST_CASE(duplicateExpressionLoop);
TEST_CASE(duplicateValueTernary);
TEST_CASE(duplicateValueTernarySizeof); // #13773
TEST_CASE(duplicateExpressionTernary); // #6391
TEST_CASE(duplicateExpressionTemplate); // #6930
TEST_CASE(duplicateExpressionCompareWithZero);
TEST_CASE(oppositeExpression);
TEST_CASE(duplicateVarExpression);
TEST_CASE(duplicateVarExpressionUnique);
TEST_CASE(duplicateVarExpressionAssign);
TEST_CASE(duplicateVarExpressionCrash);
TEST_CASE(multiConditionSameExpression);
TEST_CASE(checkSignOfUnsignedVariable);
TEST_CASE(checkSignOfPointer);
TEST_CASE(checkSuspiciousSemicolon1);
TEST_CASE(checkSuspiciousSemicolon2);
TEST_CASE(checkSuspiciousSemicolon3);
TEST_CASE(checkSuspiciousComparison);
TEST_CASE(checkInvalidFree);
TEST_CASE(checkRedundantCopy);
TEST_CASE(checkNegativeShift);
TEST_CASE(incompleteArrayFill);
TEST_CASE(redundantVarAssignment);
TEST_CASE(redundantVarAssignment_trivial);
TEST_CASE(redundantVarAssignment_struct);
TEST_CASE(redundantVarAssignment_union);
TEST_CASE(redundantVarAssignment_7133);
TEST_CASE(redundantVarAssignment_stackoverflow);
TEST_CASE(redundantVarAssignment_lambda);
TEST_CASE(redundantVarAssignment_loop);
TEST_CASE(redundantVarAssignment_after_switch);
TEST_CASE(redundantVarAssignment_pointer);
TEST_CASE(redundantVarAssignment_pointer_parameter);
TEST_CASE(redundantVarAssignment_array);
TEST_CASE(redundantVarAssignment_switch_break);
TEST_CASE(redundantInitialization);
//TEST_CASE(redundantMemWrite); // FIXME: temporary hack
TEST_CASE(redundantAssignmentSameValue);
TEST_CASE(varFuncNullUB);
TEST_CASE(checkCastIntToCharAndBack); // ticket #160
TEST_CASE(checkCommaSeparatedReturn);
TEST_CASE(checkPassByReference);
TEST_CASE(checkComparisonFunctionIsAlwaysTrueOrFalse);
TEST_CASE(integerOverflow); // #5895
TEST_CASE(redundantPointerOp);
TEST_CASE(test_isSameExpressio
B72
n);
TEST_CASE(raceAfterInterlockedDecrement);
TEST_CASE(testUnusedLabel);
TEST_CASE(testUnusedLabelConfiguration);
TEST_CASE(testUnusedLabelSwitchConfiguration);
TEST_CASE(testUnusedLabelPremiumMisra);
TEST_CASE(testEvaluationOrder);
TEST_CASE(testEvaluationOrderSelfAssignment);
TEST_CASE(testEvaluationOrderMacro);
TEST_CASE(testEvaluationOrderSequencePointsFunctionCall);
TEST_CASE(testEvaluationOrderSequencePointsComma);
TEST_CASE(testEvaluationOrderSizeof);
TEST_CASE(testUnsignedLessThanZero);
TEST_CASE(doubleMove1);
TEST_CASE(doubleMoveMemberInitialization1);
TEST_CASE(doubleMoveMemberInitialization2);
TEST_CASE(doubleMoveMemberInitialization3); // #9974
TEST_CASE(doubleMoveMemberInitialization4);
TEST_CASE(moveAndAssign1);
TEST_CASE(moveAndAssign2);
TEST_CASE(moveAssignMoveAssign);
TEST_CASE(moveAndReset1);
TEST_CASE(moveAndReset2);
TEST_CASE(moveResetMoveReset);
TEST_CASE(moveAndFunctionParameter);
TEST_CASE(moveAndFunctionParameterReference);
TEST_CASE(moveAndFunctionParameterConstReference);
TEST_CASE(moveAndFunctionParameterUnknown);
TEST_CASE(moveAndReturn);
TEST_CASE(moveAndClear);
TEST_CASE(movedPointer);
TEST_CASE(moveAndAddressOf);
TEST_CASE(partiallyMoved);
TEST_CASE(moveAndLambda);
TEST_CASE(moveInLoop);
TEST_CASE(moveCallback);
TEST_CASE(moveClassVariable);
TEST_CASE(forwardAndUsed);
TEST_CASE(moveAndReference);
TEST_CASE(moveForRange);
TEST_CASE(moveTernary);
TEST_CASE(movePointerAlias);
TEST_CASE(funcArgNamesDifferent);
TEST_CASE(funcArgOrderDifferent);
TEST_CASE(cpp11FunctionArgInit); // #7846 - "void foo(int declaration = {}) {"
TEST_CASE(shadowVariables);
TEST_CASE(knownArgument);
TEST_CASE(knownArgumentHiddenVariableExpression);
TEST_CASE(knownArgumentTernaryOperator);
TEST_CASE(checkComparePointers);
TEST_CASE(unusedVariableValueTemplate); // #8994
TEST_CASE(moduloOfOne);
TEST_CASE(sameExpressionPointers);
TEST_CASE(checkOverlappingWrite);
TEST_CASE(constVariableArrayMember); // #10371
TEST_CASE(knownPointerToBool);
TEST_CASE(iterateByValue);
TEST_CASE(knownConditionFloating);
TEST_CASE(knownConditionPrefixed);
TEST_CASE(unionZeroInitBasic);
TEST_CASE(unionZeroInitArrayMember);
TEST_CASE(unionZeroInitStructMember);
TEST_CASE(unionZeroInitUnknownType);
TEST_CASE(unionZeroInitBitfields);
}
struct CheckOptions
{
bool cpp = true;
bool inconclusive = true;
bool verbose = false;
Settings* settings = nullptr; // TODO: split from this
};
#define check(...) check_(__FILE__, __LINE__, __VA_ARGS__)
template<size_t size>
void check_(const char* file, int line, const char (&code)[size], const CheckOptions& opt = make_default_obj{}) {
// TODO: do not modify object passed into
Settings* settings;
if (!opt.settings) {
settings = &settings1;
}
else {
settings = opt.settings;
}
settings->certainty.setEnabled(Certainty::inconclusive, opt.inconclusive);
settings->verbose = opt.verbose;
// Tokenize..
SimpleTokenizer tokenizer(*settings, *this, opt.cpp);
ASSERT_LOC(tokenizer.tokenize(code), file, line);
// Check..
runChecks<CheckOther>(tokenizer, this);
}
struct CheckPOptions
{
bool cpp = true;
};
#define checkP(...) checkP_(__FILE__, __LINE__, __VA_ARGS__)
template<size_t size>
void checkP_(const char* file, int line, const char (&code)[size], const CheckPOptions& options = make_default_obj()) {
SimpleTokenizer2 tokenizer(settings2, *this, code, options.cpp ? "test.cpp" : "test.c");
// Tokenizer..
ASSERT_LOC(tokenizer.simplifyTokens1(""), file, line);
// Check..
runChecks<CheckOther>(tokenizer, this);
}
template<size_t size>
void checkInterlockedDecrement(const char (&code)[size]) {
/*const*/ Settings settings = settingsBuilder().platform(Platform::Type::Win32A).build();
check(code, dinit(CheckOptions, $.inconclusive = false, $.settings = &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:2:16]: (error) Division by zero. [zerodiv]\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:2:14]: (error) Division by zero. [zerodiv]\n", errout_str());
check("int foo(int i) {\n"
" return i % 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2:14]: (error) Division by zero. [zerodiv]\n", errout_str());
check("void foo(int& i) {\n"
" i /= 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2:7]: (error) Division by zero. [zerodiv]\n", errout_str());
check("void foo(int& i) {\n"
" i %= 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2:7]: (error) Division by zero. [zerodiv]\n", errout_str());
check("uint8_t foo(uint8_t i) {\n"
" return i / 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2:14]: (error) Division by zero. [zerodiv]\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:3:15]: (error) Division by zero. [zerodiv]\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:3:15]: (error) Division by zero. [zerodiv]\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:3:15]: (error) Division by zero. [zerodiv]\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:3:15]: (error) Division by zero. [zerodiv]\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:3:14]: (error) Division by zero. [zerodiv]\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:2:16]: (error) Division by zero. [zerodiv]\n"
"[test.cpp:3:16]: (error) Division by zero. [zerodiv]\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:4:12]: (error, inconclusive) Division by zero. [zerodiv]\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:2:18]: (error) Division by zero. [zerodiv]\n"
"[test.cpp:3:18]: (error) Division by zero. [zerodiv]\n", errout_str());
check("void f() {\n"
" int res = (a+2)/0;\n"
" int res = (a*2)/0;\n"
"}");
ASSERT_EQUALS("", errout_str());
}
void zeroDiv12() {
// #8141
check("intmax_t f() {\n"
" return 1 / imaxabs(0);\n"
"}");
ASSERT_EQUALS("[test.cpp:2:12]: (error) Division by zero. [zerodiv]\n", errout_str());
}
void zeroDiv13() {
// #7324
check("int f () {\n"
" int dividend = 10;\n"
" int divisor = 1;\n"
" dividend = dividend / (--divisor);\n"
" return dividend;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:25]: (error) Division by zero. [zerodiv]\n", errout_str());
}
void zeroDiv14() {
check("void f() {\n" // #1169
" double dx = 1.;\n"
" int ix = 1;\n"
" int i = 1;\n"
" std::cout << ix / (i >> 1) << std::endl;\n"
" std::cout << dx / (i >> 1) << std::endl;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5:21]: (error) Division by zero. [zerodiv]\n", errout_str());
}
void zeroDiv15() { // #8319
check("int f(int i) { return i - 1; }\n"
"int f() {\n"
" const int d = 1;\n"
" const int r = 1 / f(d);\n"
" return r;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4:21]: (error) Division by zero. [zerodiv]\n", errout_str());
}
// #11158
void zeroDiv16()
{
check("int f(int i) {\n"
" int number = 10, a = 0;\n"
" for (int count = 0; count < 2; count++) {\n"
" a += (i / number) % 10;\n"
" number = number / 10;\n"
" }\n"
" return a;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
check("int f(int i) {\n"
" int number = 10, a = 0;\n"
" for (int count = 0; count < 2; count++) {\n"
" int x = number / 10;\n"
" a += (i / number) % 10;\n"
" number = x;\n"
" }\n"
" return a;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void zeroDiv17() { // #9931
check("int f(int len) {\n"
" int sz = sizeof(void*[255]) / 255;\n"
" int x = len % sz;\n"
" return x;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void zeroDiv18()
{
check("int f(int x, int y) {\n"
" if (x == y) {}\n"
" return 1 / (x-y);\n"
"}\n");
ASSERT_EQUALS(
"[test.cpp:2:11] -> [test.cpp:3:14]: (warning) Either the condition 'x==y' is redundant or there is division by zero at line 3. [zerodivcond]\n",
errout_str());
}
void zeroDiv19()
{
check("void f() {\n" // #2456
" for (int i = 0;;)\n"
" int j = 10 / i;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3:20]: (error) Division by zero. [zerodiv]\n", errout_str());
}
void zeroDiv20()
{
check("uint16_t f(void)\n" // #11175
"{\n"
" uint16_t x = 0xFFFFU;\n" // UINT16_MAX=0xFFFF
" return 42/(++x);\n"
"}");
ASSERT_EQUALS("[test.cpp:4:14]: (error) Division by zero. [zerodiv]\n", errout_str());
}
void zeroDiv21()
{
check("int f(int n) {\n"
" return 1 / ((1 / n) - 1);\n"
"}\n"
"int g() {\n"
" return f(1);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2:14]: (error) Division by zero. [zerodiv]\n", errout_str());
}
void zeroDiv22()
{
check("int main() {\n"
" return _Generic((0), int: (42) / (0), default: 0);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2:36]: (error) Division by zero. [zerodiv]\n", errout_str());
}
void zeroDivCond() {
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x > 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3:9] -> [test.cpp:2:14]: (warning) Either the condition 'x>0' is redundant or there is division by zero at line 2. [zerodivcond]\n", errout_str());
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x >= 1) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3:9] -> [test.cpp:2:14]: (warning) Either the condition 'x>=1' is redundant or there is division by zero at line 2. [zerodivcond]\n", errout_str());
check("void f(int x) {\n"
" int y = 17 / x;\n"
" if (x == 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3:9] -> [test.cpp:2:14]: (warning) Either the condition 'x==0' is redundant or there is division by zero at line 2. [zerodivcond]\n", errout_str());
check("void f(unsigned int x) {\n"
" int y = 17 / x;\n"
" if (x != 0) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:3:9] -> [test.cpp:2:14]: (warning) Either the condition 'x!=0' is redundant or there is division by zero at line 2. [zerodivcond]\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:4:10] -> [test.cpp:1:28]: (warning) Either the condition 'y>0' is redundant or there is division by zero at line 1. [zerodivcond]\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:6:9] -> [test.cpp:4:14]: (warning) Either the condition 'x!=0' is redundant or there is division by zero at line 4. [zerodivcond]\n", errout_str());
}
check("void do_something(int value);\n"
"void f(int x) {\n"
" int y = 17 / x;\n"
" do_something(x);\n"
"}");
ASSERT_EQUALS("", errout_str());
check("int x;\n"
"void f() {\n"
" int y = 17 / x;\n"
" while (y || x == 0) { x--; }\n"
"}");
ASSERT_EQUALS("", errout_str());
// ticket 5033 segmentation fault (valid code) in CheckOther::checkZeroDivisionOrUselessCondition
check("void f() {\n"
"double* p1= new double[1];\n"
"double* p2= new double[1];\n"
"double* p3= new double[1];\n"
"double* pp[3] = {p1,p2,p3};\n"
"}");
ASSERT_EQUALS("", errout_str());
// #5105 - FP
check("int f(int a, int b) {\n"
" int r = a / b;\n"
" if (func(b)) {}\n"
"}");
ASSERT_EQUALS("", errout_str());
// Unknown types for b and c --> do not warn
check("int f(int d) {\n"
" int r = (a?b:c) / d;\n"
" if (d == 0) {}\n"
"}");
ASSERT_EQUALS("", errout_str());
check("int f(int a) {\n"
" int r = a ? 1 / a : 0;\n"
" if (a == 0) {}\n"
"}");
ASSERT_EQUALS("", errout_str());
check("int f(int a) {\n"
" int r = (a == 0) ? 0 : 1 / a;\n"
" if (a == 0) {}\n"
"}");
ASSERT_EQUALS("", errout_str());
check("int g();\n"
"void f(int b) {\n"
" int x = g();\n"
" if (x == 0) {}\n"
" else if (x > 0) {}\n"
" else\n"
" a = b / -x;\n"
"}");
ASSERT_EQUALS("", errout_str());
check("struct A {\n"
" int x;\n"
"};\n"
"int f(A* a) {\n"
" if (a->x == 0) \n"
" a->x = 1;\n"
" return 1/a->x;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
// #10049
check("int f(int argc) {\n"
" int quotient, remainder;\n"
" remainder = argc % 2;\n"
" argc = 2;\n"
" quotient = argc;\n"
" if (quotient != 0) \n"
" return quotient;\n"
" return remainder;\n"
"}\n");
ASSERT_EQUALS("", errout_str());
// #11315
checkP("#define STATIC_ASSERT(c) \\\n"
"do { enum { sa = 1/(int)(!!(c)) }; } while (0)\n"
"void f() {\n"
" STATIC_ASSERT(sizeof(int) == sizeof(FOO));\n"
"}\n");
ASSERT_EQUALS("", errout_str());
// #11505
check("void f(uint16_t num, uint8_t radix) {\n"
" int c = num % radix;\n"
" num /= radix;\n"
" if (!num) {}\n"
"}\n");
ASSERT_EQUALS("", errout_str());
}
void nanInArithmeticExpression() {
check("void f()\n"
"{\n"
" double x = 3.0 / 0.0 + 1.0;\n"
" printf(\"%f\", x);\n"
"}");
ASSERT_EQUALS("[test.cpp:3:19]: (style) Using NaN/Inf in a computation. [nanInArithmeticExpression]\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:3:19]: (style) Using NaN/Inf in a computation. [nanInArithmeticExpression]\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:3:25]: (style) Using NaN/Inf in a computation. [nanInArithmeticExpression]\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:3:25]: (style) Using NaN/Inf in a computation. [nanInArithmeticExpression]\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"