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cppcheck/test/testother.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2013 Daniel Marjamäki and 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 "preprocessor.h"
#include "tokenize.h"
#include "checkother.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestOther : public TestFixture {
public:
TestOther() : TestFixture("TestOther")
{ }
private:
void run() {
TEST_CASE(oppositeInnerCondition);
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(nanInArithmeticExpression);
TEST_CASE(sprintf1); // Dangerous usage of sprintf
TEST_CASE(sprintf2);
TEST_CASE(sprintf3);
TEST_CASE(sprintf4); // struct member
TEST_CASE(strPlusChar1); // "/usr" + '/'
TEST_CASE(strPlusChar2); // "/usr" + ch
TEST_CASE(strPlusChar3); // ok: path + "/sub" + '/'
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(oldStylePointerCast);
TEST_CASE(invalidPointerCast);
TEST_CASE(dangerousStrolUsage);
TEST_CASE(passedByValue);
TEST_CASE(mathfunctionCall1);
TEST_CASE(cctypefunctionCall);
TEST_CASE(switchRedundantAssignmentTest);
TEST_CASE(switchRedundantOperationTest);
TEST_CASE(switchRedundantBitwiseOperationTest);
TEST_CASE(switchFallThroughCase);
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(trac2071);
TEST_CASE(trac2084);
TEST_CASE(trac3693);
TEST_CASE(modulo);
TEST_CASE(incorrectLogicOperator1);
TEST_CASE(incorrectLogicOperator2);
TEST_CASE(incorrectLogicOperator3);
TEST_CASE(secondAlwaysTrueFalseWhenFirstTrueError);
TEST_CASE(incorrectLogicOp_condSwapping);
TEST_CASE(sameExpression);
TEST_CASE(memsetZeroBytes);
TEST_CASE(redundantGetAndSetUserId);
TEST_CASE(clarifyCalculation);
TEST_CASE(clarifyStatement);
TEST_CASE(clarifyCondition1); // if (a = b() < 0)
TEST_CASE(clarifyCondition2); // if (a & b == c)
TEST_CASE(clarifyCondition3); // if (! a & b)
TEST_CASE(clarifyCondition4); // ticket #3110
TEST_CASE(clarifyCondition5); // #3609 CWinTraits<WS_CHILD|WS_VISIBLE>..
TEST_CASE(clarifyCondition6); // #3818
TEST_CASE(incorrectStringCompare);
TEST_CASE(duplicateIf);
TEST_CASE(duplicateIf1); // ticket 3689
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: Fragement 2
TEST_CASE(duplicateBranch2); // empty macro
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(alwaysTrueFalseStringCompare);
TEST_CASE(suspiciousStringCompare);
TEST_CASE(checkSignOfUnsignedVariable);
TEST_CASE(checkSignOfPointer);
TEST_CASE(checkForSuspiciousSemicolon1);
TEST_CASE(checkForSuspiciousSemicolon2);
TEST_CASE(checkDoubleFree);
TEST_CASE(checkInvalidFree);
TEST_CASE(checkRedundantCopy);
TEST_CASE(checkNegativeShift);
TEST_CASE(incompleteArrayFill);
TEST_CASE(redundantVarAssignment);
TEST_CASE(redundantMemWrite);
TEST_CASE(varFuncNullUB);
TEST_CASE(checkPipeParameterSize); // ticket #3521
TEST_CASE(checkCastIntToCharAndBack); // ticket #160
TEST_CASE(checkSleepTimeIntervall)
TEST_CASE(checkCommaSeparatedReturn);
}
void check(const char code[], const char *filename = NULL, bool experimental = false, bool inconclusive = true, bool posix = false, bool runSimpleChecks=true) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
settings.addEnabled("warning");
settings.addEnabled("portability");
settings.addEnabled("performance");
settings.inconclusive = inconclusive;
settings.experimental = experimental;
settings.standards.posix = posix;
// 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) {
const std::string str1(tokenizer.tokens()->stringifyList(0,true));
tokenizer.simplifyTokenList();
const std::string str2(tokenizer.tokens()->stringifyList(0,true));
if (str1 != str2)
warn(("Unsimplified code in test case\nstr1="+str1+"\nstr2="+str2).c_str());
checkOther.runSimplifiedChecks(&tokenizer, &settings, this);
}
}
class SimpleSuppressor: public ErrorLogger {
public:
SimpleSuppressor(Settings &settings, ErrorLogger *next)
: _settings(settings), _next(next)
{ }
virtual void reportOut(const std::string &outmsg) {
_next->reportOut(outmsg);
}
virtual void reportErr(const ErrorLogger::ErrorMessage &msg) {
if (!msg._callStack.empty() && !_settings.nomsg.isSuppressed(msg._id, msg._callStack.begin()->getfile(), msg._callStack.begin()->line))
_next->reportErr(msg);
}
private:
Settings &_settings;
ErrorLogger *_next;
};
void check_preprocess_suppress(const char precode[], const char *filename = NULL) {
// Clear the error buffer..
errout.str("");
if (filename == NULL)
filename = "test.cpp";
Settings settings;
settings.addEnabled("warning");
settings.addEnabled("style");
settings.addEnabled("performance");
settings.experimental = true;
// Preprocess file..
SimpleSuppressor logger(settings, this);
Preprocessor preprocessor(&settings, &logger);
std::list<std::string> configurations;
std::string filedata = "";
std::istringstream fin(precode);
preprocessor.preprocess(fin, filedata, configurations, filename, settings._includePaths);
const std::string code = preprocessor.getcode(filedata, "", filename);
// Tokenize..
Tokenizer tokenizer(&settings, &logger);
std::istringstream istr(code);
tokenizer.tokenize(istr, filename);
tokenizer.simplifyGoto();
// Check..
CheckOther checkOther(&tokenizer, &settings, &logger);
checkOther.checkSwitchCaseFallThrough();
checkOther.checkAlwaysTrueOrFalseStringCompare();
logger.reportUnmatchedSuppressions(settings.nomsg.getUnmatchedLocalSuppressions(filename));
}
void oppositeInnerCondition() {
check("void foo(int a, int b)\n"
"{\n"
" if(a==b)\n"
" if(a!=b)\n"
" cout << a;\n"
"}", "test.cpp", true, true);
ASSERT_EQUALS("[test.cpp:3]: (warning, inconclusive) Opposite conditions in nested 'if' blocks lead to a dead code block.\n", errout.str());
check("void foo(int i)\n"
"{\n"
" if(i > 5) {\n"
" i = bar();\n"
" if(i < 5) {\n"
" cout << a;\n"
" }\n"
" }\n"
"}", "test.cpp", true, true);
ASSERT_EQUALS("", errout.str());
check("void foo(int& i)\n"
"{\n"
" i=6;\n"
"}\n"
"void bar(int i)\n"
"{\n"
" if(i>5){\n"
" foo(i);\n"
" if(i<5){\n"
" }\n"
" }\n"
"}", "test.cpp", true, true);
ASSERT_EQUALS("", errout.str());
}
void emptyBrackets() {
check("{\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv1() {
check("void foo() {\n"
" cout << 1. / 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("void f()\n"
"{\n"
" div_t divresult = div (1,0);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (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("[test.cpp:3]: (error) Division by zero.\n", errout.str());
check("void f()\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("[test.cpp:3]: (error) Division by zero.\n", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0L);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Division by zero.\n", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0x5);\n"
"}");
ASSERT_EQUALS("", 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());
// Don't warn about 0.0
check("void f()\n"
"{\n"
" div_t divresult = div (1,0.0);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" div_t divresult = div (1,0.5);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void zeroDiv5() {
check("void f()\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("[test.cpp:3]: (error) Division by zero.\n", errout.str());
}
void zeroDiv7() {
check("void f() {\n"
" int a = 1/2*3/0;\n"
" int b = 1/2*3%0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Division by zero.\n"
"[test.cpp:3]: (error) Division by zero.\n", errout.str());
}
void nanInArithmeticExpression() {
check("void f()\n"
"{\n"
" double x = 3.0 / 0.0 + 1.0\n"
" printf(\"%f\n\", 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\n\", 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\n\", 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\n\", 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\n\", x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void sprintfUsage(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
//tokenizer.tokens()->printOut( "tokens" );
// Check for redundant code..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.invalidFunctionUsage();
}
void sprintf1() {
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%s\",buf);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Undefined behavior: Variable 'buf' is used as parameter and destination in s[n]printf().\n", errout.str());
}
void sprintf2() {
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%i\",sizeof(buf));\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void sprintf3() {
sprintfUsage("void foo()\n"
"{\n"
" char buf[100];\n"
" sprintf(buf,\"%i\",sizeof(buf));\n"
" if (buf[0]);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void sprintf4() {
sprintfUsage("struct A\n"
"{\n"
" char filename[128];\n"
"};\n"
"\n"
"void foo()\n"
"{\n"
" const char* filename = \"hello\";\n"
" struct A a;\n"
" snprintf(a.filename, 128, \"%s\", filename);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void strPlusChar(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for redundant code..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.strPlusChar();
}
void strPlusChar1() {
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" const char *p = \"/usr\" + '/';\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Unusual pointer arithmetic. A value of type 'char' is added to a string literal.\n", errout.str());
}
void strPlusChar2() {
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" char ch = 1;\n"
" const char *p = ch + \"/usr\";\n"
"}");
ASSERT_EQUALS("", errout.str());
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" int i = 1;\n"
" const char* psz = \"Bla\";\n"
" const std::string str = i + psz;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void strPlusChar3() {
// Strange looking pointer arithmetic..
strPlusChar("void foo()\n"
"{\n"
" std::string temp = \"/tmp\";\n"
" std::string path = temp + '/' + \"sub\" + '/';\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for redundant code..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkVariableScope();
}
void varScope1() {
varScope("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() {
varScope("int foo()\n"
"{\n"
" Error e;\n"
" e.SetValue(12);\n"
" throw e;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope3() {
varScope("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() {
varScope("void foo()\n"
"{\n"
" int i;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope5() {
varScope("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());
varScope("void f(int x) {\n"
" const unsigned char i = 0;\n"
" if (x) {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'i' can be reduced.\n", errout.str());
varScope("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() {
varScope("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());
varScope("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());
varScope("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() {
varScope("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() {
varScope("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
varScope("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() {
varScope("int f()\n"
"{\n"
" int x = 0;\n"
" FOR {\n"
" foo(x++);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope11() {
varScope("int f() {\n"
" int x = 0;\n"
" AB ab = { x, 0 };\n"
"}");
ASSERT_EQUALS("", errout.str());
varScope("int f() {\n"
" int x = 0;\n"
" if (a == 0) { ++x; }\n"
" AB ab = { x, 0 };\n"
"}");
ASSERT_EQUALS("", errout.str());
varScope("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() {
varScope("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());
varScope("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());
varScope("void f(int x) {\n"
" const bool b = true;\n"
" x++;\n"
" if (x == 5)\n"
" foo(b);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) The scope of the variable 'b' can be reduced.\n", errout.str());
varScope("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
varScope("void f() {\n"
" int i = 0;\n"
" forever {\n"
" if (i++ == 42) { break; }\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope14() {
// #3941
varScope("void f() {\n"
" const int i( foo());\n"
" if(a) {\n"
" for ( ; i < 10; ++i) ;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope15() {
// #4573
varScope("void f() {\n"
" int a,b,c;\n"
" if (a);\n"
" else if(b);\n"
" else if(c);\n"
" else;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void varScope16() {
varScope("void f() {\n"
" int a = 0;\n"
" while((++a) < 56) {\n"
" foo();\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
varScope("void f() {\n"
" int a = 0;\n"
" do {\n"
" foo();\n"
" } while((++a) < 56);\n"
"}");
ASSERT_EQUALS("", errout.str());
varScope("void f() {\n"
" int a = 0;\n"
" do {\n"
" a = 64;\n"
" foo(a);\n"
" } while((++a) < 56);\n"
"}");
ASSERT_EQUALS("", errout.str());
varScope("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() {
varScope("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());
varScope("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() {
varScope("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());
varScope("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());
varScope("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());
varScope("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 checkOldStylePointerCast(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
// Tokenize..
Tokenizer tokenizerCpp(&settings, this);
std::istringstream istr(code);
tokenizerCpp.tokenize(istr, "test.cpp");
Tokenizer tokenizerC(&settings, this);
std::istringstream istr2(code);
tokenizerC.tokenize(istr2, "test.c");
CheckOther checkOtherCpp(&tokenizerCpp, &settings, this);
checkOtherCpp.warningOldStylePointerCast();
CheckOther checkOtherC(&tokenizerC, &settings, this);
checkOtherC.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 *) ( 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());
}
void checkInvalidPointerCast(const char code[], bool portability = false, 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]: (warning) Casting between float* and double* which have an incompatible binary data representation.\n"
"[test.cpp:4]: (warning) Casting between float* and long double* which have an incompatible binary data representation.\n",
"[test.cpp:3]: (warning) Casting between float* and double* which have an incompatible binary data representation.\n"
"[test.cpp:4]: (warning) 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]: (warning) Casting between 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]: (warning) Casting between double* and long double* which have an incompatible binary data representation.\n"
"[test.cpp:3]: (warning) 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]: (warning) Casting between integer* and long double* which have an incompatible binary data representation.\n"
"[test.cpp:3]: (warning) Casting between integer* and double* which have an incompatible binary data representation.\n"
"[test.cpp:4]: (warning) 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]: (warning) 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]: (warning) 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 dangerousStrolUsage() {
{
sprintfUsage("int f(const char *num)\n"
"{\n"
" return strtol(num, NULL, 1);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Invalid radix in call to strtol(). It must be 0 or 2-36.\n", errout.str());
}
{
sprintfUsage("int f(const char *num)\n"
"{\n"
" return strtol(num, NULL, 10);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
}
void testPassedByValue(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("performance");
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkConstantFunctionParameter();
}
void passedByValue() {
testPassedByValue("void f(const std::string str) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'str' should be passed by reference.\n", errout.str());
testPassedByValue("class Foo;\nvoid f(const Foo foo) {}");
ASSERT_EQUALS("[test.cpp:2]: (performance) Function parameter 'foo' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::string &str) {}");
ASSERT_EQUALS("", errout.str());
testPassedByValue("void f(const std::vector<int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::vector<std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::vector<std::string>::size_type s) {}");
ASSERT_EQUALS("", errout.str());
testPassedByValue("void f(const std::vector<int> &v) {}");
ASSERT_EQUALS("", errout.str());
testPassedByValue("void f(const std::map<int,int> &v) {}");
ASSERT_EQUALS("", errout.str());
testPassedByValue("void f(const std::map<int,int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::map<std::string,std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::map<int,std::string> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::map<std::string,int> v) {}");
ASSERT_EQUALS("[test.cpp:1]: (performance) Function parameter 'v' should be passed by reference.\n", errout.str());
testPassedByValue("void f(const std::streamoff pos) {}");
ASSERT_EQUALS("", errout.str());
}
void mathfunctionCall1() {
// log|log10
check("void foo()\n"
"{\n"
" std::cout << log(-2) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -2 to log() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-1.) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1. to log() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-1.0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1.0 to log() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(-0.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -0.1 to log() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0 to log() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0.) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0. to log() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(0.0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 0.0 to log() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1.0E+3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1.0E-3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(1E-3) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::string *log(0);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << log(2.0) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3473 - no warning if "log" is a variable
check("Fred::Fred() : log(0) { }");
ASSERT_EQUALS("", errout.str());
// acos
check("void foo()\n"
"{\n"
" std::cout << acos(1) << std::endl;\n"
" std::cout << acos(-1) << std::endl;\n"
" std::cout << acos(0.1) << std::endl;\n"
" std::cout << acos(0.0001) << std::endl;\n"
" std::cout << acos(0.01) << std::endl;\n"
" std::cout << acos(1.0E-1) << std::endl;\n"
" std::cout << acos(-1.0E-1) << std::endl;\n"
" std::cout << acos(+1.0E-1) << std::endl;\n"
" std::cout << acos(0.1E-1) << std::endl;\n"
" std::cout << acos(+0.1E-1) << std::endl;\n"
" std::cout << acos(-0.1E-1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(1.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value 1.1 to acos() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(-1.1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1.1 to acos() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << acos(-110) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -110 to acos() leads to undefined result.\n", errout.str());
// atan2
check("void foo()\n"
"{\n"
" std::cout << atan2(1,1) << std::endl;\n"
" std::cout << atan2(-1,-1) << std::endl;\n"
" std::cout << atan2(0.1,1) << std::endl;\n"
" std::cout << atan2(0.0001,100) << std::endl;\n"
" std::cout << atan2(0.01m-1) << std::endl;\n"
" std::cout << atan2(1.0E-1,-3) << std::endl;\n"
" std::cout << atan2(-1.0E-1,+2) << std::endl;\n"
" std::cout << atan2(+1.0E-1,0) << std::endl;\n"
" std::cout << atan2(0.1E-1,3) << std::endl;\n"
" std::cout << atan2(+0.1E-1,1) << std::endl;\n"
" std::cout << atan2(-0.1E-1,8) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << atan2(0,0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing values 0 and 0 to atan2() leads to undefined result.\n", errout.str());
// fmod
check("void foo()\n"
"{\n"
" std::cout << fmod(1.0,0) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing values 1.0 and 0 to fmod() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << fmod(1.0,1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
// pow
check("void foo()\n"
"{\n"
" std::cout << pow(0,-10) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing values 0 and -10 to pow() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << pow(0,10) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
// sqrt
check("void foo()\n"
"{\n"
" std::cout << sqrt(-1) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -1 to sqrt() leads to undefined result.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << sqrt(1) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void cctypefunctionCall() {
// isalnum
check("void foo()\n"
"{\n"
" std::cout << isalnum(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isalnum(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to isalnum() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isalpha(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isalpha(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to isalpha() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << iscntrl(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << iscntrl(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to iscntrl() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isdigit(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isdigit(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to isdigit() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isgraph(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isgraph(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to isgraph() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << islower(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << islower(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to islower() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isprint(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isprint(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to isprint() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << ispunct(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << ispunct(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to ispunct() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isspace(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isspace(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to isspace() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isupper(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isupper(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to isupper() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isxdigit(61) << std::endl;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" std::cout << isxdigit(-61) << std::endl;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Passing value -61 to isxdigit() causes undefined behavior which may lead to a crash.\n", errout.str());
check("void f() {\n"
"std::isgraph(-10000, loc);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (error) Passing value -10000 to isgraph() causes undefined behavior which may lead to a crash.\n", errout.str());
}
void switchRedundantAssignmentTest() {
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:9]: (warning) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y = 2;\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:11]: (warning) Variable 'y' is reassigned a value before the old one has been used. 'break;' missing?\n", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" case 3:\n"
" if (x)\n"
" {\n"
" y = 3;\n"
" }\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" {\n"
" y = 2;\n"
" if (z)\n"
" printf(\"%d\", y);\n"
" }\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int x = a;\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" x = 2;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" break;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" continue;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" while(xyz()) {\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" throw e;\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" printf(\"%d\", y);\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" int y = 1;\n"
" switch (x)\n"
" {\n"
" case 2:\n"
" y = 2;\n"
" bar();\n"
" case 3:\n"
" y = 3;\n"
" }\n"
" bar(y);\n"
"}");
ASSERT_EQUALS("", 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(char *str, int a)\n"
"{\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" strcpy(str, \"a'\");\n"
" case 3:\n"
" strcpy(str, \"b'\");\n"
" }\n"
"}", 0, false, false, false, false);
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(char *str, int a)\n"
"{\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" strncpy(str, \"a'\");\n"
" case 3:\n"
" strncpy(str, \"b'\");\n"
" }\n"
"}");
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(char *str, int a)\n"
"{\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"
"}", 0, false, false, false, false);
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(char *str, int a)\n"
"{\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(char *str, int a)\n"
"{\n"
" switch (a)\n"
" {\n"
" case 2:\n"
" strcpy(str, \"a'\");\n"
" printf(str);\n"
" case 3:\n"
" strcpy(str, \"b'\");\n"
" }\n"
"}", 0, false, false, false, false);
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"
"}", 0, false, 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"
"}", 0, false, 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("", 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("", 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 switchFallThroughCase() {
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" break;\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" break;\n"
" case 2:\n"
" continue;\n"
" case 3:\n"
" return;\n"
" case 4:\n"
" exit(1);\n"
" case 5:\n"
" goto end;\n"
" case 6:\n"
" throw e;\n"
" case 7:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 0:\n"
" case 1:\n"
" break;\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" default:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" // fall through\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" /* FALLTHRU */\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" break;\n"
" // fall through\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (information) Unmatched suppression: switchCaseFallThrough\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" for (;;) {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" break;\n"
" } else {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" break;\n"
" } else {\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" } else {\n"
" break;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" if (b) {\n"
" case 2:\n"
" } else {\n"
" break;\n"
" }\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" int x;\n"
" case 1:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" switch (b) {\n"
" case 1:\n"
" return;\n"
" default:\n"
" return;\n"
" }\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
// This fails because the switch parsing code currently doesn't understand
// that all paths after g() actually return. It's a pretty unusual case
// (no pun intended).
TODO_ASSERT_EQUALS("",
"[test.cpp:11]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
"#ifndef A\n"
" g();\n"
" // fall through\n"
"#endif\n"
" case 2:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" goto leave;\n"
" case 2:\n"
" break;\n"
" }\n"
"leave:\n"
" if (x) {\n"
" g();\n"
" return;\n"
" }\n"
"}");
// This fails because Tokenizer::simplifyGoto() copies the "leave:" block
// into where the goto is, but because it contains a "return", it omits
// copying a final return after the block.
TODO_ASSERT_EQUALS("",
"[test.cpp:5]: (style) Switch falls through case without comment. 'break;' missing?\n", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" switch (a) {\n"
" case 1:\n"
" g();\n"
" // fall through\n"
" case 2:\n"
" g();\n"
" // falls through\n"
" case 3:\n"
" g();\n"
" // fall-through\n"
" case 4:\n"
" g();\n"
" // drop through\n"
" case 5:\n"
" g();\n"
" // pass through\n"
" case 5:\n"
" g();\n"
" // no break\n"
" case 5:\n"
" g();\n"
" // fallthru\n"
" case 6:\n"
" g();\n"
" /* fall */\n"
" default:\n"
" break;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"void foo() {\n"
" // unrelated comment saying 'fall through'\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"
"}", 0, false, 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"
"}", 0, false, 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"
"}", 0, false, false, false, false);
ASSERT_EQUALS("[test.cpp:3]: (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"
" break;\n"
" case 1:\n"
" c++;\n"
" break;\n"
" }\n"
"}", 0, false, 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"
"}", 0, false, 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"
"}", 0, false, 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"
"}", 0, false, false, false, false);
ASSERT_EQUALS("", errout.str());
check("void foo() {\n"
" throw 0;\n"
" return;\n"
"}", 0, false, 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"
"}", 0, false, 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"
"}", 0, false, 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() {\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"
"}", 0, false, 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"
"}", 0, false, false, false, false);
ASSERT_EQUALS("[test.cpp:4]: (style) Consecutive return, break, continue, goto or throw statements are unnecessary.\n", errout.str());
check("int foo() {\n"
" return 0;\n"
" label:\n"
" throw 0;\n"
"}", 0, false, false, false, false);
ASSERT_EQUALS("", 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
check("%: return ; ()"); // Don't crash. #3441.
// #3383. TODO: Use preprocessor
check("int foo() {\n"
"\n" // #ifdef A
" return 0;\n"
"\n" // #endif
" return 1;\n"
"}", 0, false, false, false, false);
ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
"\n" // #ifdef A
" return 0;\n"
"\n" // #endif
" return 1;\n"
"}", 0, false, true, false, 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"
"}", 0, false, 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"
"}", 0, false, false, false, false);
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\n\", ({x==0;}));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int x) {\n"
" printf(\"%i\n\", ({int x = do_something(); x == 0;}));\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int x) {\n"
" printf(\"%i\n\", ({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("void foo()\n"
"{\n"
" std::string var = var = \"test\";\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Redundant assignment of 'var' 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 'var' to itself.\n", 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]: (error) 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", 0, false, 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"
" }\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]: (error) 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]: (error) 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"
"}\n"
);
ASSERT_EQUALS("[test.cpp:7]: (error) 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"
"}\n";
check(code, "test.cpp");
ASSERT_EQUALS("[test.cpp:7]: (error) 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"
"}");
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"
"}\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"
" }\n"
" Foo(char x, int y) { }\n"
"};\n";
check(code, "test.cpp");
ASSERT_EQUALS("[test.cpp:4]: (error) Instance of 'Foo' object is destroyed immediately.\n", errout.str());
}
void trac2084() {
check("void f()\n"
"{\n"
" struct sigaction sa;\n"
"\n"
" { sigaction(SIGHUP, &sa, 0); };\n"
" { sigaction(SIGINT, &sa, 0); };\n"
"}\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 modulo() {
check("bool f(bool& b1, bool& b2, bool& b3) {\n"
" b1 = a % 5 == 4;\n"
" b2 = a % c == 100000;\n"
" b3 = a % 5 == c;\n"
" return a % 5 == 5-p;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("bool f(bool& b1, bool& b2, bool& b3, bool& b4, bool& b5) {\n"
" b1 = a % 5 < 5;\n"
" b2 = a % 5 <= 5;\n"
" b3 = a % 5 == 5;\n"
" b4 = a % 5 != 5;\n"
" b5 = a % 5 >= 5;\n"
" return a % 5 > 5;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n"
"[test.cpp:3]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n"
"[test.cpp:4]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n"
"[test.cpp:5]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n"
"[test.cpp:6]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n"
"[test.cpp:7]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n", errout.str());
check("void f(bool& b1, bool& b2) {\n"
" b1 = bar() % 5 < 889;\n"
" if(x[593] % 5 <= 5)\n"
" b2 = x.a % 5 == 5;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n"
"[test.cpp:3]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n"
"[test.cpp:4]: (warning) Comparison of modulo result is predetermined, because it is always less than 5.\n", errout.str());
}
void incorrectLogicOperator1() {
check("void f(int x) {\n"
" if ((x != 1) || (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x != 1 || x != 3.\n", errout.str());
check("void f(int x) {\n"
" if (1 != x || 3 != x)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x != 1 || x != 3.\n", errout.str());
check("void f(int x, int y) {\n"
" if (x != 1 || y != 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((y == 1) && (x != 1) || (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 1) || (x != 3) && (y == 1))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x != 1) && (x != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x == 1) || (x == 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 1) || (y != 3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != hotdog) || (y != hotdog))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, int y) {\n"
" if ((x != 5) || (y != 5))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x != 5) || (x != 6))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x != 5 || x != 6.\n", errout.str());
check("void f(unsigned int a, unsigned int b, unsigned int c) {\n"
" if((a != b) || (c != b) || (c != a))\n"
" {\n"
" return true;\n"
" }\n"
" return false;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void incorrectLogicOperator2() {
check("void f(float x) {\n"
" if ((x == 1) && (x == 1.0))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x == 1) && (x == 0x00000001))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:2]: (style) Same expression on both sides of '&&'.\n", errout.str());
check("void f(int x) {\n"
" if (x == 1 && x == 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x == 1 && x == 3.\n", errout.str());
check("void f(int x) {\n"
" if (x == 1.0 && x == 3.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x == 1.0 && x == 3.0.\n", errout.str());
check("void f(float x) {\n"
" if (x == 1 && x == 1.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x < 1 && x > 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 1.\n", errout.str());
check("void f(int x) {\n"
" if (x < 1.0 && x > 1.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1.0 && x > 1.0.\n", errout.str());
check("void f(int x) {\n"
" if (x < 1 && x > 1.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 1.0.\n", errout.str());
check("void f(int x) {\n"
" if (x < 1 && x > 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(float x) {\n"
" if (x < 1.0 && x > 3.0)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1.0 && x > 3.0.\n", errout.str());
check("void f(int x) {\n"
" if (1 > x && 3 < x)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(int x) {\n"
" if (x < 3 && x > 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x > 3 || x < 10)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x > 3 || x < 10.\n", errout.str());
check("void f(int x) {\n"
" if (x >= 3 || x <= 10)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x >= 3 || x <= 10.\n", errout.str());
check("void f(int x) {\n"
" if (x >= 3 || x < 10)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x >= 3 || x < 10.\n", errout.str());
check("void f(int x) {\n"
" if (x > 3 || x <= 10)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x > 3 || x <= 10.\n", errout.str());
check("void f(int x) {\n"
" if (x > 3 || x < 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x >= 3 || x <= 3)\n"
" a++;\n"
"}"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x >= 3 || x <= 3.\n", errout.str());
check("void f(int x) {\n"
" if (x >= 3 || x < 3)\n"
" a++;\n"
"}"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x >= 3 || x < 3.\n", errout.str());
check("void f(int x) {\n"
" if (x > 3 || x <= 3)\n"
" a++;\n"
"}"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x > 3 || x <= 3.\n", errout.str());
check("void f(int x) {\n"
" if((x==3) && (x!=4))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 3, the comparison x != 4 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x!=4) && (x==3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 3, the comparison x != 4 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x==3) || (x!=4))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 3, the comparison x != 4 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x!=4) || (x==3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 3, the comparison x != 4 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x==3) && (x!=3))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x != 3 && x == 3.\n", errout.str());
check("void f(int x) {\n"
" if ((x==6) || (x!=6))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical disjunction always evaluates to true: x != 6 || x == 6.\n", errout.str());
check("void f(int x) {\n"
" if (x > 10 || x < 3)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if (x > 5 && x == 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x > 5 && x == 1.\n", errout.str());
check("void f(int x) {\n"
" if (x > 5 && x == 6)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
// #3419
check("void f() {\n"
" if ( &q != &a && &q != &b ) { }\n"
"}");
ASSERT_EQUALS("", errout.str());
// #3676
check("void f(int m_x2, int w, int x) {\n"
" if (x + w - 1 > m_x2 || m_x2 < 0 )\n"
" m_x2 = x + w - 1;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void incorrectLogicOperator3() {
check("void f(int x, bool& b) {\n"
" b = x > 5 && x == 1;\n"
" c = x < 1 && x == 3;\n"
" d = x >= 5 && x == 1;\n"
" e = x <= 1 && x == 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x > 5 && x == 1.\n"
"[test.cpp:3]: (warning) Logical conjunction always evaluates to false: x < 1 && x == 3.\n"
"[test.cpp:4]: (warning) Logical conjunction always evaluates to false: x >= 5 && x == 1.\n"
"[test.cpp:5]: (warning) Logical conjunction always evaluates to false: x <= 1 && x == 3.\n", errout.str());
}
void secondAlwaysTrueFalseWhenFirstTrueError() {
check("void f(int x) {\n"
" if (x > 5 && x != 1)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x > 5, the comparison x != 1 is always true.\n", errout.str());
check("void f(int x) {\n"
" if (x > 5 && x != 6)\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x) {\n"
" if ((x > 5) && (x != 1))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x > 5, the comparison x != 1 is always true.\n", errout.str());
check("void f(int x) {\n"
" if ((x > 5) && (x != 6))\n"
" a++;\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check("void f(int x, bool& b) {\n"
" b = x > 3 || x == 4;\n"
" c = x < 5 || x == 4;\n"
" d = x >= 3 || x == 4;\n"
" e = x <= 5 || x == 4;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x == 4, the comparison x > 3 is always true.\n"
"[test.cpp:3]: (style) Redundant condition: If x == 4, the comparison x < 5 is always true.\n"
"[test.cpp:4]: (style) Redundant condition: If x == 4, the comparison x >= 3 is always true.\n"
"[test.cpp:5]: (style) Redundant condition: If x == 4, the comparison x <= 5 is always true.\n", errout.str());
check("void f(int x, bool& b) {\n"
" b = x > 5 || x != 1;\n"
" c = x < 1 || x != 3;\n"
" d = x >= 5 || x != 1;\n"
" e = x <= 1 || x != 3;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x > 5, the comparison x != 1 is always true.\n"
"[test.cpp:3]: (style) Redundant condition: If x < 1, the comparison x != 3 is always true.\n"
"[test.cpp:4]: (style) Redundant condition: If x >= 5, the comparison x != 1 is always true.\n"
"[test.cpp:5]: (style) Redundant condition: If x <= 1, the comparison x != 3 is always true.\n", errout.str());
check("void f(int x, bool& b) {\n"
" b = x > 6 && x > 5;\n"
" c = x > 5 || x > 6;\n"
" d = x < 6 && x < 5;\n"
" e = x < 5 || x < 6;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Redundant condition: If x > 6, the comparison x > 5 is always true.\n"
"[test.cpp:3]: (style) Redundant condition: If x > 5, the comparison x > 6 is always true.\n"
"[test.cpp:4]: (style) Redundant condition: If x < 6, the comparison x < 5 is always true.\n"
"[test.cpp:5]: (style) Redundant condition: If x < 6, the comparison x < 5 is always true.\n", errout.str());
}
void incorrectLogicOp_condSwapping() {
check("void f(int x) {\n"
" if (x < 1 && x > 3)\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(int x) {\n"
" if (1 > x && x > 3)\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(int x) {\n"
" if (x < 1 && 3 < x)\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(int x) {\n"
" if (1 > x && 3 < x)\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(int x) {\n"
" if (x > 3 && x < 1)\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(int x) {\n"
" if (3 < x && x < 1)\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(int x) {\n"
" if (x > 3 && 1 > x)\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
check("void f(int x) {\n"
" if (3 < x && 1 > x)\n"
" a++;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Logical conjunction always evaluates to false: x < 1 && x > 3.\n", errout.str());
}
void sameExpression() {
// #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());
}
void memsetZeroBytes() {
check("void f() {\n"
" memset(p, 10, 0x0);\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) memset() called to fill 0 bytes of 'p'.\n", errout.str());
check("void f() {\n"
" memset(p, sizeof(p), 0);\n"
"}\n"
);
ASSERT_EQUALS("[test.cpp:2]: (warning) memset() called to fill 0 bytes of 'p'.\n", errout.str());
check("void f() {\n"
" memset(p, sizeof(p), i);\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
}
void redundantGetAndSetUserId() {
check("seteuid(geteuid());\n", NULL, false , false, true);
ASSERT_EQUALS("[test.cpp:1]: (warning) Redundant get and set of user id.\n", errout.str());
check("setuid(getuid());\n", NULL, false , false, true);
ASSERT_EQUALS("[test.cpp:1]: (warning) Redundant get and set of user id.\n", errout.str());
check("setgid(getgid());\n", NULL, false , false, true);
ASSERT_EQUALS("[test.cpp:1]: (warning) Redundant get and set of user id.\n", errout.str());
check("setegid(getegid());\n", NULL, false , false, true);
ASSERT_EQUALS("[test.cpp:1]: (warning) Redundant get and set of user id.\n", errout.str());
check("seteuid(getuid());\n", NULL, false , false, true);
ASSERT_EQUALS("", errout.str());
check("seteuid(foo());\n", NULL, false , false, true);
ASSERT_EQUALS("", errout.str());
check("foo(getuid());\n", NULL, false , false, true);
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());
// Ticket #2585 - segmentation fault for invalid code
check("abcdef?""?<"
"123456?""?>"
"+?""?=");
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,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());
// 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());
}
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());
}
// clarify conditions with = and comparison
void clarifyCondition1() {
check("void f() {\n"
" if (x = b() < 0) {}\n" // don't simplify and verify this code
"}", 0, false, false, false, false);
ASSERT_EQUALS("[test.cpp:2]: (style) Suspicious condition (assignment + comparison); Clarify expression with parentheses.\n", errout.str());
check("void f(int i) {\n"
" for (i = 0; i < 10; i++) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" x = a<int>(); if (x) {}\n"
"}");
ASSERT_EQUALS("", errout.str());
}
// clarify conditions with bitwise operator and comparison
void clarifyCondition2() {
check("void f() {\n"
" if (x & 2 == 2) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Suspicious condition (bitwise operator + comparison); Clarify expression with parentheses.\n", errout.str());
check("void f() {\n"
" if (a & fred1.x == fred2.y) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Suspicious condition (bitwise operator + comparison); Clarify expression with parentheses.\n", errout.str());
}
// clarify condition that uses ! operator and then bitwise operator
void clarifyCondition3() {
check("void f(int w) {\n"
" if(!w & 0x8000) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Boolean result is used in bitwise operation. Clarify expression with parentheses.\n", errout.str());
check("void f() {\n"
" if (x == foo() & 2) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (style) Boolean result is used in bitwise operation. Clarify expression with parentheses.\n", errout.str());
check("void f(std::list<int> &ints) { }");
ASSERT_EQUALS("", errout.str());
check("void f() { A<x &> a; }");
ASSERT_EQUALS("", errout.str());
check("void f() { a(x<y|z,0); }", "test.c"); // filename is c => there are never templates
ASSERT_EQUALS("[test.c:1]: (style) Boolean result is used in bitwise operation. Clarify expression with parentheses.\n", errout.str());
check("class A<B&,C>;", "test.C");
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" if (result != (char *)&inline_result) { }\n" // don't simplify and verify cast
"}", 0, false, false, false, false);
ASSERT_EQUALS("", errout.str());
}
void clarifyCondition4() { // ticket #3110
check("typedef double SomeType;\n"
"typedef std::pair<std::string,SomeType> PairType;\n"
"struct S\n"
"{\n"
" bool operator()\n"
" ( PairType const & left\n"
" , PairType const & right) const\n"
" {\n"
" return left.first < right.first;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void clarifyCondition5() { // ticket #3609 (using | in template instantiation)
check("CWinTraits<WS_CHILD|WS_VISIBLE>::GetWndStyle(0);");
ASSERT_EQUALS("", errout.str());
}
void clarifyCondition6() {
check("template<class Y>\n"
"SharedPtr& operator=( SharedPtr<Y> const & r ) {\n"
" px = r.px;\n"
" return *this;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void incorrectStringCompare() {
check("int f() {\n"
" return test.substr( 0 , 4 ) == \"Hello\" ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) String literal \"Hello\" doesn't match length argument for substr().\n", errout.str());
check("int f() {\n"
" return test.substr( 0 , 5 ) == \"Hello\" ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" return \"Hello\" == test.substr( 0 , 4 ) ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) String literal \"Hello\" doesn't match length argument for substr().\n", errout.str());
check("int f() {\n"
" return \"Hello\" == foo.bar<int>().z[1].substr(i+j*4, 4) ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) String literal \"Hello\" doesn't match length argument for substr().\n", errout.str());
check("int f() {\n"
" return \"Hello\" == test.substr( 0 , 5 ) ? : 0 : 1 ;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" if (\"Hello\") { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Conversion of string literal \"Hello\" to bool always evaluates to true.\n", errout.str());
check("int f() {\n"
" if (\"Hello\" && test) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Conversion of string literal \"Hello\" to bool always evaluates to true.\n", errout.str());
check("int f() {\n"
" if (test && \"Hello\") { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Conversion of string literal \"Hello\" to bool always evaluates to true.\n", errout.str());
check("int f() {\n"
" while (\"Hello\") { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Conversion of string literal \"Hello\" to bool always evaluates to true.\n", errout.str());
check("int f() {\n"
" assert (test || \"Hello\");\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Conversion of string literal \"Hello\" to bool always evaluates to true.\n", errout.str());
check("int f() {\n"
" assert (test && \"Hello\");\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" assert (\"Hello\" || test);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Conversion of string literal \"Hello\" to bool always evaluates to true.\n", errout.str());
check("int f() {\n"
" assert (\"Hello\" && test);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" BOOST_ASSERT (\"Hello\" && test);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("int f() {\n"
" return f2(\"Hello\");\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateIf() {
check("void f(int a, int &b) {\n"
" if (a) { b = 1; }\n"
" else { if (a) { b = 2; } }\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (style) Duplicate conditions in 'if' and related 'else if'.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a) { b = 1; }\n"
" else { if (a) { b = 2; } }\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:2]: (style) Duplicate conditions in 'if' and related 'else if'.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a == 1) { b = 1; }\n"
" else { if (a == 2) { b = 2; }\n"
" else { if (a == 1) { b = 3; } } }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:2]: (style) Duplicate conditions in 'if' and related 'else if'.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a == 1) { b = 1; }\n"
" else { if (a == 2) { b = 2; }\n"
" else { if (a == 2) { b = 3; } } }\n"
"}");
ASSERT_EQUALS("[test.cpp:4] -> [test.cpp:3]: (style) Duplicate conditions in 'if' and related 'else if'.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a == 1) {\n"
" b = 1;\n"
" if (b == 1) { }\n" // condition is always true. must skip simplifications
" else if (b == 1) { }\n"
" } else if (a == 2) { b = 2; }\n"
" else if (a == 2) { b = 3; }\n"
"}", 0, false, false, false, false);
ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:6]: (style) Duplicate conditions in 'if' and related 'else if'.\n"
"[test.cpp:5] -> [test.cpp:4]: (style) Duplicate conditions in 'if' and related 'else if'.\n", errout.str());
check("void f(int a, int &b) {\n"
" if (a++) { b = 1; }\n"
" else { if (a++) { b = 2; }\n"
" else { if (a++) { b = 3; } } }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int a, int &b) {\n"
" if (!strtok(NULL," ")) { b = 1; }\n"
" else { if (!strtok(NULL," ")) { b = 2; } }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int a, int &b) {\n"
" x = x / 2;\n"
" if (x < 100) { b = 1; }\n"
" else { x = x / 2; if (x < 100) { b = 2; } }\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(int i) {\n"
" if(i == 0x02e2000000 || i == 0xa0c6000000)\n"
" foo(i);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void f(const std::string &token)\n"
"{\n"
" if( token == \"C\")\n"
" {\n"
" std::cout << \"C\";\n"
" }\n"
" else { if ( token == \"A\" )\n"
" {\n"
" std::cout << \"A\";\n"
" }\n"
" else { if ( token == \"A\" )\n"
" {\n"
" std::cout << \"A\";\n"
" }\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:11] -> [test.cpp:7]: (style) Duplicate conditions in 'if' and related 'else if'.\n", 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) 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) 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) 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"
"}", 0, false, 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) 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: Fragement 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) 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) Found duplicate branches for 'if' and 'else'.\n", errout.str());
}
void duplicateBranch2() {
Preprocessor::macroChar = '$';
check("void f(int x) {\n" // #4329
" if (x)\n"
" $;\n"
" else\n"
" $;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void duplicateExpression1() {
check("void foo() {\n"
" if (a == a) { }\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
check("void fun() {\n"
" return a && a ||\n"
" b == b &&\n"
" c - c &&\n"
" d > d &&\n"
" e < e &&\n"
" f ;\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:2]: (style) Same expression on both sides of '&&'.\n"
"[test.cpp:3] -> [test.cpp:3]: (style) Same expression on both sides of '=='.\n"
"[test.cpp:4] -> [test.cpp:4]: (style) Same expression on both sides of '-'.\n"
"[test.cpp:5] -> [test.cpp:5]: (style) Same expression on both sides of '>'.\n"
"[test.cpp:6] -> [test.cpp:6]: (style) Same expression on both sides of '<'.\n", errout.str());
check("void foo() {\n"
" return a && a;\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [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] -> [test.cpp:2]: (style) Same expression on both sides of '&&'.\n", errout.str());
check("void foo() {\n"
" f(a,b == b);\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:2]: (style) Same expression on both sides of '=='.\n", errout.str());
check("void foo() {\n"
" f(b == b, a);\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [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] -> [test.cpp:2]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void foo() {\n"
" if (x!=2 || x!=3 || x!=2) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [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] -> [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("", errout.str());
check("void foo() {\n"
" if ((a + b) | (a + b)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [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] -> [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());
}
void duplicateIf1() { // ticket 3689 ( avoid false positive )
check("int fitInt(long long int nValue){\n"
" if( nValue < 0x7fffffffLL )\n"
" {\n"
" return 32;\n"
" }\n"
" if( nValue < 0x7fffffffffffLL )\n"
" {\n"
" return 48;\n"
" }\n"
" else {\n"
" if( nValue < 0x7fffffffffffffffLL )\n"
" {\n"
" return 64;\n"
" } else\n"
" {\n"
" return -1;\n"
" }\n"
" }\n"
"}");
ASSERT_EQUALS("", 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());
}
void duplicateExpression3() {
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] -> [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] -> [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 ((strcmp(a, b) == 0) || (strcmp(a, b) == 0)) {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:2]: (style) Same expression on both sides of '||'.\n", errout.str());
check("void foo() {\n"
" if (str == \"(\" || str == \"(\") {}\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [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());
}
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());
}
void duplicateExpression5() { // #3749 - macros with same values
Preprocessor::macroChar = '$';
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 alwaysTrueFalseStringCompare() {
check_preprocess_suppress(
"#define MACRO \"00FF00\"\n"
"int main()\n"
"{\n"
" if (strcmp(MACRO,\"00FF00\") == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Unnecessary comparison of static strings.\n", errout.str());
check_preprocess_suppress(
"int main()\n"
"{\n"
" if (stricmp(\"hotdog\",\"HOTdog\") == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Unnecessary comparison of static strings.\n", errout.str());
check_preprocess_suppress(
"#define MACRO \"Hotdog\"\n"
"int main()\n"
"{\n"
" if (QString::compare(\"Hamburger\", MACRO) == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Unnecessary comparison of static strings.\n", errout.str());
check_preprocess_suppress(
"int main()\n"
"{\n"
" if (QString::compare(argv[2], \"hotdog\") == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("", errout.str());
check_preprocess_suppress(
"int main()\n"
"{\n"
" if (strncmp(\"hotdog\",\"hotdog\", 6) == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Unnecessary comparison of static strings.\n", errout.str());
check(
"int foo(const char *buf)\n"
"{\n"
" if (strcmp(buf, buf) == 0)"
" {"
" std::cout << \"Equal\n\""
" }"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Comparison of identical string variables.\n", errout.str());
check_preprocess_suppress(
"int main() {\n"
" if (\"str\" == \"str\") {\n"
" std::cout << \"Equal\n\"\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Unnecessary comparison of static strings.\n", errout.str());
check_preprocess_suppress(
"int main() {\n"
" if (\"str\" != \"str\") {\n"
" std::cout << \"Equal\n\"\n"
" }\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Unnecessary comparison of static strings.\n", errout.str());
check_preprocess_suppress(
"int main() {\n"
" if (a+\"str\" != \"str\"+b) {\n"
" std::cout << \"Equal\n\"\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void suspiciousStringCompare() {
check("bool foo(char* c) {\n"
" return c == \"x\";\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) String literal compared with variable 'c'. Did you intend to use strcmp() instead?\n", errout.str());
check("bool foo(const char* c) {\n"
" return \"x\" == c;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) String literal compared with variable 'c'. Did you intend to use strcmp() instead?\n", errout.str());
check("bool foo(char* c) {\n"
" return foo+\"x\" == c;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("bool foo(char* c) {\n"
" return \"x\" == c+foo;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("bool foo(const std::string& c) {\n"
" return \"x\" == c;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("bool foo(const Foo* c) {\n"
" return \"x\" == c->bar();\n" // #4314
"}");
ASSERT_EQUALS("", errout.str());
// Ticket #4257
check("bool foo() {\n"
"MyString *str=Getter();\n"
"return *str==\"bug\"; }\n", "test.c");
ASSERT_EQUALS("[test.c:3]: (warning) String literal compared with variable 'str'. Did you intend to use strcmp() instead?\n", errout.str());
// Ticket #4257
check("bool foo() {\n"
"MyString *str=Getter();\n"
"return *str==\"bug\"; }");
ASSERT_EQUALS("", errout.str());
// Ticket #4257
check("bool foo() {\n"
"MyString **str=OtherGetter();\n"
"return *str==\"bug\"; }");
TODO_ASSERT_EQUALS("[test.cpp:2]: (warning) String literal compared with variable 'c'. Did you intend to use strcmp() instead?\n",
"",
errout.str());
// Ticket #4257
check("bool foo() {\n"
"MyString str=OtherGetter2();\n"
"return &str==\"bug\"; }");
TODO_ASSERT_EQUALS("[test.cpp:2]: (warning) String literal compared with variable 'c'. Did you intend to use strcmp() instead?\n",
"",
errout.str());
}
void check_signOfUnsignedVariable(const char code[], bool inconclusive=false) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("style");
settings.inconclusive = inconclusive;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Check for redundant code..
CheckOther checkOther(&tokenizer, &settings, this);
checkOther.checkSignOfUnsignedVariable();
}
void checkSignOfUnsignedVariable() {
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x) {\n"
" if (x < 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x) {\n"
" if (0 > x)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x) {\n"
" if (x >= 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x, bool y) {\n"
" if (x < 0 && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x, bool y) {\n"
" if (0 > x && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x, bool y) {\n"
" if (x >= 0 && y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x, bool y) {\n"
" if (y && x < 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x, bool y) {\n"
" if (y && 0 > x)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x, bool y) {\n"
" if (y && x >= 0)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x, bool y) {\n"
" if (x < 0 || y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int x, bool y) {\n"
" if (0 > x || y)"
" return true;\n"
" return false;\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"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_signOfUnsignedVariable(code, false);
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(code, 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_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int* x) {\n"
" if (*x >= 0)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int* x) {\n"
" if (*x < 0)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int* x) {\n"
" if (0 <= x[0])"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"bool foo(Bar* x) {\n"
" if (0 <= x.y)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"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_signOfUnsignedVariable(
"bool foo(int* x) {\n"
" if (0 > x[0])"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"bool foo(Bar* x) {\n"
" if (0 > x.y)"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"void foo() {\n"
" int (*t)(void *a, void *b);\n"
" if (t(a, b) < 0)\n"
" bar();\n"
"}");
ASSERT_EQUALS("", errout.str());
check_signOfUnsignedVariable(
"void foo() {\n"
" int (*t)(void *a, void *b);\n"
" if (0 > t(a, b))\n"
" bar();\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 checkDoubleFree() {
check(
"void foo(char *p) {\n"
" free(p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p, char *r) {\n"
" free(p);\n"
" free(r);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo() {\n"
" free(p);\n"
" free(r);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" if (x < 3) free(p);\n"
" else { if (x > 9) free(p); }\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" free(p);\n"
" getNext(&p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" free(p);\n"
" bar();\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p) {\n"
" free(p);\n"
" printf(\"Freed memory at location %x\", p);\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(DIR *p) {\n"
" closedir(p);\n"
" closedir(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Directory handle 'p' closed twice.\n", errout.str());
check(
"void foo(DIR *p, DIR *r) {\n"
" closedir(p);\n"
" closedir(r);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(DIR *p) {\n"
" if (x < 3) closedir(p);\n"
" else { if (x > 9) closedir(p); }\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(DIR *p) {\n"
" closedir(p);\n"
" gethandle(&p);\n"
" closedir(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(DIR *p) {\n"
" closedir(p);\n"
" gethandle();\n"
" closedir(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Directory handle 'p' closed twice.\n", errout.str());
check(
"void foo(Data* p) {\n"
" free(p->a);\n"
" free(p->b);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void f() {\n"
" char *p; p = malloc(100);\n"
" if (x) {\n"
" free(p);\n"
" exit();\n"
" }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void f() {\n"
" char *p; p = malloc(100);\n"
" if (x) {\n"
" free(p);\n"
" x = 0;\n"
" }\n"
" free(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void f() {\n"
" char *p; p = do_something();\n"
" free(p);\n"
" p = do_something();\n"
" free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" g_free(p);\n"
" g_free(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p, char *r) {\n"
" g_free(p);\n"
" g_free(r);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" g_free(p);\n"
" getNext(&p);\n"
" g_free(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" g_free(p);\n"
" bar();\n"
" g_free(p);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p) {\n"
" delete p;\n"
" delete p;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p, char *r) {\n"
" delete p;\n"
" delete r;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete p;\n"
" getNext(&p);\n"
" delete p;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete p;\n"
" bar();\n"
" delete p;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p) {\n"
" delete[] p;\n"
" delete[] p;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"void foo(char *p, char *r) {\n"
" delete[] p;\n"
" delete[] r;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete[] p;\n"
" getNext(&p);\n"
" delete[] p;\n"
"}");
ASSERT_EQUALS("", errout.str());
check(
"void foo(char *p) {\n"
" delete[] p;\n"
" bar();\n"
" delete[] p;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory pointed to by 'p' is freed twice.\n", errout.str());
check(
"~LineMarker() {\n"
" delete pxpm;\n"
"}\n"
"LineMarker &operator=(const LineMarker &) {\n"
" delete pxpm;\n"
" pxpm = NULL;\n"
" return *this;\n"
"}"
);
ASSERT_EQUALS("", errout.str());
check(
"void foo()\n"
"{\n"
" int* ptr; ptr = NULL;\n"
" try\n"
" {\n"
" ptr = new int(4);\n"
" }\n"
" catch(...)\n"
" {\n"
" delete ptr;\n"
" throw;\n"
" }\n"
" delete ptr;\n"
"}"
);
ASSERT_EQUALS("", errout.str());
check(
"int foo()\n"
"{\n"
" int* a; a = new int;\n"
" bool doDelete; doDelete = true;\n"
" if (a != 0)\n"
" {\n"
" doDelete = false;\n"
" delete a;\n"
" }\n"
" if(doDelete)\n"
" delete a;\n"
" return 0;\n"
"}"
);
ASSERT_EQUALS("", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" while(true) {\n"
" x = new char[100];\n"
" if (y++ > 100)\n"
" break;\n"
" delete[] x;\n"
" }\n"
" delete[] x;\n"
"}"
);
ASSERT_EQUALS("", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" for (int i = 0; i < 10000; i++) {\n"
" x = new char[100];\n"
" delete[] x;\n"
" }\n"
" delete[] x;\n"
"}"
);
ASSERT_EQUALS("[test.cpp:8]: (error) Memory pointed to by 'x' is freed twice.\n", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" while (isRunning()) {\n"
" x = new char[100];\n"
" delete[] x;\n"
" }\n"
" delete[] x;\n"
"}"
);
ASSERT_EQUALS("[test.cpp:8]: (error) Memory pointed to by 'x' is freed twice.\n", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" while (isRunning()) {\n"
" x = malloc(100);\n"
" free(x);\n"
" }\n"
" free(x);\n"
"}"
);
TODO_ASSERT_EQUALS("[test.cpp:8]: (error) Memory pointed to by 'x' is freed twice.\n", "", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" for (;;) {\n"
" x = new char[100];\n"
" if (y++ > 100)\n"
" break;\n"
" delete[] x;\n"
" }\n"
" delete[] x;\n"
"}"
);
ASSERT_EQUALS("", errout.str());
check(
"void foo(int y)\n"
"{\n"
" char * x; x = NULL;\n"
" do {\n"
" x = new char[100];\n"
" if (y++ > 100)\n"
" break;\n"
" delete[] x;\n"
" } while (true);\n"
" delete[] x;\n"
"}"
);
ASSERT_EQUALS("", errout.str());
check(
"void f()\n"
"{\n"
" char *p; p = 0;\n"
" if (x < 100) {\n"
" p = malloc(10);\n"
" free(p);\n"
" }\n"
" free(p);\n"
"}"
);
TODO_ASSERT_EQUALS("[test.cpp:8]: (error) Memory pointed to by 'p' is freed twice.\n", "", errout.str());
check(
"void MyFunction()\n"
"{\n"
" char* data; data = new char[100];\n"
" try\n"
" {\n"
" }\n"
" catch(err)\n"
" {\n"
" delete[] data;\n"
" MyThrow(err);\n"
" }\n"
" delete[] data;\n"
"}\n"
"void MyThrow(err)\n"
"{\n"
" throw(err);\n"
"}\n"
);
ASSERT_EQUALS("", errout.str());
check(
"void MyFunction()\n"
"{\n"
" char* data; data = new char[100];\n"
" try\n"
" {\n"
" }\n"
" catch(err)\n"
" {\n"
" delete[] data;\n"
" MyExit(err);\n"
" }\n"
" delete[] data;\n"
"}\n"
"void MyExit(err)\n"
"{\n"
" exit(err);\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 check_redundant_copy(const char code[]) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.addEnabled("performance");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// Simplify token list..
CheckOther checkOther(&tokenizer, &settings, this);
tokenizer.simplifyTokenList();
checkOther.checkRedundantCopy();
}
void checkRedundantCopy() {
check_redundant_copy("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) Use const reference for 'a' to avoid unnecessary data copying.\n", errout.str());
check_redundant_copy("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_redundant_copy("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("", errout.str());
check_redundant_copy("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) Use const reference for 'a' to avoid unnecessary data copying.\n", errout.str());
check_redundant_copy("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_redundant_copy("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_redundant_copy("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());
}
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.\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.\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.\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.\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());
}
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("[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: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("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]: (performance) 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"
" i = 1;\n"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance, inconclusive) Variable 'i' is reassigned a value before the old one has been used if variable is no semaphore variable.\n", errout.str());
check("void f() {\n"
" int i;\n"
" i = 1;\n"
" i = 1;\n"
"}", NULL, false, false, false, false);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) 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"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance, inconclusive) Variable 'i' is reassigned a value before the old one has been used if variable is no semaphore variable.\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"
"}");
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance, inconclusive) Variable 'bar' is reassigned a value before the old one has been used if variable is no semaphore variable.\n", 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]: (performance) 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"
"}", NULL, false, false, false, false);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:5]: (performance) 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"
"}", NULL, false, false, false, false);
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]: (performance) 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]: (performance) 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();\n"
"};\n"
"\n"
"void C::f(Foo z) {\n"
" x = 2;\n"
" x = z.g();\n"
"}");
ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:9]: (performance, inconclusive) Variable 'x' is reassigned a value before the old one has been used if variable is no semaphore variable.\n", 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"
"}", NULL, false, false, false, false);
ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (performance) 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());
check("void f() {\n" // Ticket #4356
" int x = 0;\n" // <- ignore assignment with 0
" x = 3;\n"
"}", 0, false, false, false, false);
ASSERT_EQUALS("", errout.str());
check("void f() {\n"
" int i = 54;\n"
" i = 0;\n"
"}", 0, false, false, false, false);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (performance) Variable 'i' is reassigned a value before the old one has been used.\n", errout.str());
check("void f() {\n"
" int i = 54;\n"
" i = 1;\n"
"}", 0, false, false, false, false);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (performance) Variable 'i' is reassigned a value before the old one has been used.\n", errout.str());
check("int foo() {\n" // #4420
" int x;\n"
" bar(++x);\n"
" x = 5;\n"
" return bar(x);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void redundantMemWrite() {
// Simple tests
check("void f(void* a) {\n"
" memcpy(a, foo, bar);\n"
" memset(a, 0, bar);\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (performance) Buffer 'a' is being written before its old content has been used.\n", errout.str());
check("void* a;\n"
"void f() {\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"
" void* a = foo();\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());
// 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(void* a) {\n"
" strcpy(a, foo);\n"
" strcat(a, bar);\n" // Not redundant
" strcpy(a, x);\n" // Redundant
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (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(void* a) {\n"
" snprintf(a, foo, bar);\n"
" bar();\n"
" memset(a, 0, size);\n"
"}");
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:4]: (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"
" void* a = foo();\n"
" memset(a, 0, size);\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 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());
}
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
check("void f(){\n"
"int pipefd[1];\n" //<-- array of two integers is needed
"if (pipe(pipefd) == -1) {\n"
" return;\n"
" }\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer 'pipefd' must have size of 2 integers if used as parameter of pipe().\n", errout.str());
check("void f(){\n"
"int pipefd[2];\n"
"if (pipe(pipefd) == -1) {\n"
" return;\n"
" }\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("", errout.str());
check("void f(){\n"
"int pipefd[20];\n"
"if (pipe(pipefd) == -1) {\n"
" return;\n"
" }\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("", errout.str());
check("void f(){\n"
"int pipefd[1];\n" //<-- array of two integers is needed
"if (pipe2(pipefd,0) == -1) {\n"
" return;\n"
" }\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("[test.cpp:3]: (error) Buffer 'pipefd' must have size of 2 integers if used as parameter of pipe().\n", errout.str());
check("void f(){\n"
"int pipefd[2];\n"
"if (pipe2(pipefd,0) == -1) {\n"
" return;\n"
" }\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("", errout.str());
check("void f(){\n"
"int pipefd[20];\n"
"if (pipe2(pipefd,0) == -1) {\n"
" return;\n"
" }\n"
"}",NULL,false,false,true);
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());
}
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("voif 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("voif 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("voif f (FILE * pFile){\n"
"int i;\n"
"do {\n"
" i = getc (pFile);\n"
"} while (i != EOF)"
"}");
ASSERT_EQUALS("", errout.str());
check("voif f (FILE * pFile){\n"
"int i;\n"
"do {\n"
" i = getc (pFile);\n"
"} while (EOF != i)"
"}");
ASSERT_EQUALS("", errout.str());
// check fgetc
check("voif 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("voif 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("voif f (FILE * pFile){\n"
"signed char c;\n"
"do {\n"
" c = fgetc (pFile);\n"
"} while (EOF != c)"
"}");
ASSERT_EQUALS("", errout.str());
check("voif f (FILE * pFile){\n"
"int i;\n"
"do {\n"
" i = fgetc (pFile);\n"
"} while (i != EOF)"
"}");
ASSERT_EQUALS("", errout.str());
check("voif 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 checkSleepTimeIntervall() {
// check usleep(), which is allowed to be called with in a range of [0,999999]
check("void f(){\n"
"usleep(10000);\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("", errout.str());
check("void f(){\n"
"usleep(999999);\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("", errout.str());
check("void f(){\n"
"usleep(1000000);\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("[test.cpp:2]: (error) The argument of usleep must be less than 1000000.\n", errout.str());
check("void f(){\n"
"usleep(1000001);\n"
"}",NULL,false,false,true);
ASSERT_EQUALS("[test.cpp:2]: (error) The argument of usleep must be less than 1000000.\n", errout.str());
}
void checkCommaSeparatedReturn() {
check("int fun(int a) {\n"
" if (a < 0)\n"
" return a++,\n"
" do_something();\n"
"}", NULL, false, false, 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"
"}", NULL, false, false, false, false);
ASSERT_EQUALS("", errout.str());
check("int fun(int a) {\n"
" if (a < 0)\n"
" return a+5,\n"
" do_something();\n"
"}", NULL, false, false, 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"
"}", NULL, false, false, false, false);
ASSERT_EQUALS("", errout.str());
check("int fun(int a) {\n"
" if (a < 0)\n"
" return a<int,\nint>::b;\n"
"}", NULL, false, false, false, false);
ASSERT_EQUALS("", errout.str());
// ticket #4927 Segfault in CheckOther::checkCommaSeparatedReturn() on invalid code
check("int main() {\n"
" return 0\n"
"}", NULL, false, false, false, false);
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestOther)
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