123 lines
4.0 KiB
C++
123 lines
4.0 KiB
C++
/*
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* Cppcheck - A tool for static C/C++ code analysis
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* Copyright (C) 2007-2014 Daniel Marjamäki and Cppcheck team.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "preprocessor.h"
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#include "tokenize.h"
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#include "symboldatabase.h"
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#include "checktype.h"
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#include "testsuite.h"
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#include "testutils.h"
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#include <sstream>
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#include <tinyxml2.h>
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extern std::ostringstream errout;
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class TestType : public TestFixture {
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public:
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TestType() : TestFixture("TestType") {
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}
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private:
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void run() {
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TEST_CASE(checkTooBigShift);
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TEST_CASE(checkIntegerOverflow);
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TEST_CASE(signConversion);
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}
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void check(const char code[], Settings* settings = 0) {
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// Clear the error buffer..
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errout.str("");
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if (!settings) {
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static Settings _settings;
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settings = &_settings;
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}
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settings->addEnabled("warning");
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// Tokenize..
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Tokenizer tokenizer(settings, this);
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std::istringstream istr(code);
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tokenizer.tokenize(istr, "test.cpp");
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// Check..
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CheckType checkType(&tokenizer, settings, this);
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checkType.runChecks(&tokenizer, settings, this);
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}
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void checkTooBigShift() {
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Settings settings;
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settings.platform(Settings::Unix32);
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check("int foo(int x) {\n"
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" return x << 32;\n"
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"}",&settings);
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ASSERT_EQUALS("[test.cpp:2]: (error) Shifting 32-bit value by 32 bits is undefined behaviour\n", errout.str());
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check("int foo(int x) {\n"
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" return x << 2;\n"
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"}",&settings);
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ASSERT_EQUALS("", errout.str());
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check("int foo(int x) {\n"
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" return (long long)x << 40;\n"
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"}",&settings);
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ASSERT_EQUALS("", errout.str());
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}
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void checkIntegerOverflow() {
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Settings settings;
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settings.platform(Settings::Unix32);
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check("int foo(int x) {\n"
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" if (x==123456) {}\n"
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" return x * x;\n"
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"}",&settings);
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ASSERT_EQUALS("[test.cpp:3]: (warning) Signed integer overflow for expression 'x*x'. See condition at line 2.\n", errout.str());
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check("int foo(int x) {\n"
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" if (x==123456) {}\n"
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" return -123456 * x;\n"
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"}",&settings);
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ASSERT_EQUALS("[test.cpp:3]: (warning) Signed integer overflow for expression '-123456*x'. See condition at line 2.\n", errout.str());
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check("int foo(int x) {\n"
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" if (x==123456) {}\n"
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" return 123456U * x;\n"
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"}",&settings);
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ASSERT_EQUALS("", errout.str());
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}
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void signConversion() {
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check("unsigned int f1(signed int x, unsigned int y) {" // x is signed
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" return x * y;\n"
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"}\n"
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"void f2() { f1(-4,4); }");
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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());
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check("unsigned int f1(int x) {" // x has no signedness, but it can have the value -1 so assume it's signed
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" return x * 5U;\n"
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"}\n"
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"void f2() { f1(-4); }");
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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());
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}
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};
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REGISTER_TEST(TestType)
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