TestType() : TestFixture("TestType") {

}

void run() {

TEST_CASE(checkTooBigShift);

TEST_CASE(checkIntegerOverflow);

TEST_CASE(signConversion);

}

void check(const char code[], Settings* settings = 0) {

// Clear the error buffer..

errout.str("");

if (!settings) {

static Settings _settings;

settings = &_settings;

}

settings->addEnabled("warning");

// Tokenize..

Tokenizer tokenizer(settings, this);

std::istringstream istr(code);

tokenizer.tokenize(istr, "test.cpp");

// Check..

CheckType checkType(&tokenizer, settings, this);

checkType.runChecks(&tokenizer, settings, this);

}

void checkTooBigShift() {

Settings settings;

settings.platform(Settings::Unix32);

check("int foo(int x) {\n"

" return x << 32;\n"

"}",&settings);

ASSERT_EQUALS("[test.cpp:2]: (error) Shifting 32-bit value by 32 bits is undefined behaviour\n", errout.str());

check("int foo(int x) {\n"

" return x << 2;\n"

"}",&settings);

ASSERT_EQUALS("", errout.str());

check("int foo(int x) {\n"

" return (long long)x << 40;\n"

"}",&settings);

ASSERT_EQUALS("", errout.str());

}

void checkIntegerOverflow() {

Settings settings;

settings.platform(Settings::Unix32);

check("int foo(int x) {\n"

" if (x==123456) {}\n"

" return x * x;\n"

"}",&settings);

ASSERT_EQUALS("[test.cpp:3]: (warning) Signed integer overflow for expression 'x*x'. See condition at line 2.\n", errout.str());

check("int foo(int x) {\n"

" if (x==123456) {}\n"

" return -123456 * x;\n"

"}",&settings);

ASSERT_EQUALS("[test.cpp:3]: (warning) Signed integer overflow for expression '-123456*x'. See condition at line 2.\n", errout.str());

check("int foo(int x) {\n"

" if (x==123456) {}\n"

" return 123456U * x;\n"

"}",&settings);

ASSERT_EQUALS("", errout.str());

}

void signConversion() {

check("unsigned int f1(signed int x, unsigned int y) {" // x is signed

" return x * y;\n"

"}\n"

"void f2() { f1(-4,4); }");

ASSERT_EQUALS("[test.cpp:1]: (warning) Suspicious code: sign conversion of x in calculation, even though x can have a negative value\n", errout.str());

check("unsigned int f1(int x) {" // x has no signedness, but it can have the value -1 so assume it's signed

" return x * 5U;\n"

"}\n"

"void f2() { f1(-4); }");

ASSERT_EQUALS("[test.cpp:1]: (warning) Suspicious code: sign conversion of x in calculation, even though x can have a negative value\n", errout.str());

check("unsigned int f1(int x) {" // #6168: FP for inner calculation

" return 5U * (1234 - x);\n" // <- signed subtraction, x is not sign converted

"}\n"

"void f2() { f1(-4); }");

ASSERT_EQUALS("", errout.str());

// Dont warn for + and -

check("void f1(int x) {"

" a = x + 5U;\n"

"}\n"

"void f2() { f1(-4); }");

ASSERT_EQUALS("", errout.str());

}