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cppcheck/test/testtype.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2016 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 "checktype.h"
#include "platform.h"
#include "settings.h"
#include "testsuite.h"
#include "tokenize.h"
#include <string>
class TestType : public TestFixture {
public:
TestType() : TestFixture("TestType") {
}
private:
void run() {
TEST_CASE(checkTooBigShift_Unix32);
TEST_CASE(checkIntegerOverflow);
TEST_CASE(signConversion);
TEST_CASE(longCastAssign);
TEST_CASE(longCastReturn);
TEST_CASE(checkFloatToIntegerOverflow);
}
void check(const char code[], Settings* settings = 0, const char filename[] = "test.cpp") {
// 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, filename);
// Check..
CheckType checkType(&tokenizer, settings, this);
checkType.runChecks(&tokenizer, settings, this);
}
void checkTooBigShift_Unix32() {
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());
check("void foo() {\n"
" QList<int> someList;\n"
" someList << 300;\n"
"}", &settings);
ASSERT_EQUALS("", errout.str());
// Ticket #6793
check("template<int I> int foo(int x) { return x << I; }\n"
"const int f = foo<31>(0);\n"
"const int g = foo<100>(0);\n"
"template<int I> int hoo(int x) { return x << 32; }\n"
"const int h = hoo<100>(0);", &settings);
ASSERT_EQUALS("[test.cpp:4]: (error) Shifting 32-bit value by 32 bits is undefined behaviour\n"
"[test.cpp:1]: (error) Shifting 32-bit value by 100 bits is undefined behaviour\n", errout.str());
// #7266: C++, shift in macro
check("void f(int x) {\n"
" UINFO(x << 1234);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void checkIntegerOverflow() {
Settings settings;
settings.platform(Settings::Unix32);
settings.addEnabled("warning");
check("void foo() {\n"
" int intmax = 0x7fffffff;\n"
" return intmax + 1;\n"
"}",&settings);
ASSERT_EQUALS("[test.cpp:3]: (error) Signed integer overflow for expression 'intmax+1'.\n", errout.str());
check("void foo() {\n"
" int intmax = 0x7fffffff;\n"
" return intmax - 1;\n"
"}",&settings);
ASSERT_EQUALS("", errout.str());
check("int foo(signed int x) {\n"
" if (x==123456) {}\n"
" return x * x;\n"
"}",&settings);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (warning) Either the condition 'x==123456' is redundant or there is signed integer overflow for expression 'x*x'.\n", errout.str());
check("int foo(signed int x) {\n"
" if (x==123456) {}\n"
" return -123456 * x;\n"
"}",&settings);
ASSERT_EQUALS("[test.cpp:2] -> [test.cpp:3]: (warning) Either the condition 'x==123456' is redundant or there is signed integer overflow for expression '-123456*x'.\n", errout.str());
check("int foo(signed int x) {\n"
" if (x==123456) {}\n"
" return 123456U * x;\n"
"}",&settings);
ASSERT_EQUALS("", errout.str());
check("int foo() {\n"
" x = 1 << 31;\n" // this is technically integer overflow but it's common code
"}", &settings, "test.c");
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());
// Don't warn for + and -
check("void f1(int x) {"
" a = x + 5U;\n"
"}\n"
"void f2() { f1(-4); }");
ASSERT_EQUALS("", errout.str());
check("size_t foo(size_t x) {\n"
" return -2 * x;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Suspicious code: sign conversion of -2 in calculation because '-2' has a negative value\n", errout.str());
}
void longCastAssign() {
Settings settings;
settings.addEnabled("style");
settings.platform(Settings::Unix64);
check("long f(int x, int y) {\n"
" const long ret = x * y;\n"
" return ret;\n"
"}\n", &settings);
ASSERT_EQUALS("[test.cpp:2]: (style) int result is assigned to long variable. If the variable is long to avoid loss of information, then you have loss of information.\n", errout.str());
// typedef
check("long f(int x, int y) {\n"
" const size_t ret = x * y;\n"
" return ret;\n"
"}\n", &settings);
ASSERT_EQUALS("", errout.str());
// astIsIntResult
check("long f(int x, int y) {\n"
" const long ret = (long)x * y;\n"
" return ret;\n"
"}\n", &settings);
ASSERT_EQUALS("", errout.str());
}
void longCastReturn() {
Settings settings;
settings.addEnabled("style");
check("long f(int x, int y) {\n"
" return x * y;\n"
"}\n", &settings);
ASSERT_EQUALS("[test.cpp:2]: (style) int result is returned as long value. If the return value is long to avoid loss of information, then you have loss of information.\n", errout.str());
// typedef
check("size_t f(int x, int y) {\n"
" return x * y;\n"
"}\n", &settings);
ASSERT_EQUALS("", errout.str());
}
// This function ensure that test works with different compilers. Floats can
// be stringified differently.
static std::string removeFloat(const std::string& msg) {
std::string::size_type pos1 = msg.find("float (");
std::string::size_type pos2 = msg.find(") to integer conversion");
if (pos1 == std::string::npos || pos2 == std::string::npos || pos1 > pos2)
return msg;
return msg.substr(0,pos1+7) + msg.substr(pos2);
}
void checkFloatToIntegerOverflow() {
check("void f(void) {\n"
" return (int)1E100;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (error) Undefined behaviour: float () to integer conversion overflow.\n", removeFloat(errout.str()));
check("void f(void) {\n"
" return (int)-1E100;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (error) Undefined behaviour: float () to integer conversion overflow.\n", removeFloat(errout.str()));
check("void f(void) {\n"
" return (short)1E6;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (error) Undefined behaviour: float () to integer conversion overflow.\n", removeFloat(errout.str()));
check("void f(void) {\n"
" return (unsigned char)256.0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (error) Undefined behaviour: float () to integer conversion overflow.\n", removeFloat(errout.str()));
check("void f(void) {\n"
" return (unsigned char)255.5;\n"
"}\n");
ASSERT_EQUALS("", removeFloat(errout.str()));
}
};
REGISTER_TEST(TestType)
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