cppcheck/test/testexceptionsafety.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2010 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/>.
*/
2009-10-25 12:49:06 +01:00
#include "tokenize.h"
#include "checkexceptionsafety.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestExceptionSafety : public TestFixture
{
public:
TestExceptionSafety() : TestFixture("TestExceptionSafety")
{ }
private:
void run()
{
TEST_CASE(destructors);
TEST_CASE(newnew);
TEST_CASE(switchnewnew);
TEST_CASE(realloc);
TEST_CASE(deallocThrow);
}
void check(const std::string &code, const std::string &autodealloc = "")
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code.c_str());
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// Clear the error buffer..
errout.str("");
// Check char variable usage..
Settings settings;
settings.addEnabled("all");
std::istringstream istr2(autodealloc.c_str());
settings.autoDealloc(istr2);
CheckExceptionSafety checkExceptionSafety(&tokenizer, &settings, this);
checkExceptionSafety.runSimplifiedChecks(&tokenizer, &settings, this);
}
void destructors()
{
check("x::~x()\n"
"{\n"
" throw e;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:3]: (style) Throwing exception in destructor\n", errout.str());
}
void newnew()
{
check("C::C() : a(new A), b(new B) { }");
ASSERT_EQUALS("[test.cpp:1]: (style) Upon exception there is memory leak: a\n", errout.str());
check("C::C() : a(new A), b(new B) { }", "A\nB\n");
ASSERT_EQUALS("", errout.str());
check("C::C()\n"
"{\n"
" a = new A;\n"
" b = new B;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Upon exception there is memory leak: a\n", errout.str());
check("void a()\n"
"{\n"
" A *a1 = new A;\n"
" A *a2 = new A;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (style) Upon exception there is memory leak: a1\n", errout.str());
check("void a()\n"
"{\n"
" A *a1 = new A;\n"
" A *a2 = new (std::nothrow) A;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void a()\n"
"{\n"
" A *a1 = new A;\n"
" delete a1;\n"
" A *a2 = new A;\n"
" delete a2;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void a()\n"
"{\n"
" A *a = new A;\n"
" B *b = new B;\n"
"}\n", "A\n");
ASSERT_EQUALS("", errout.str());
// passing pointer to unknown function.. the pointer may be added to some list etc..
check("void f()\n"
"{\n"
" A *a1 = new A;\n"
" add(a1);\n"
" A *a2 = new A;\n"
"}\n", "");
ASSERT_EQUALS("", errout.str());
}
void switchnewnew()
{
check("int *f(int x)\n"
"{\n"
" int *p = 0;\n"
" switch(x)\n"
" {\n"
" case 1:\n"
" p = new int(10);\n"
" break;\n"
" case 2:\n"
" p = new int(100);\n"
" break;\n"
" };\n"
" return p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void realloc()
{
check("class A\n"
"{\n"
" int *p;\n"
" void a()\n"
" {\n"
" delete p;\n"
" p = new int[123];\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (style) Upon exception p becomes a dead pointer\n", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
" void a()\n"
" {\n"
" delete p;\n"
" p = new (std::nothrow) int[123];\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("class A\n"
"{\n"
" int *p;\n"
" void a()\n"
" {\n"
" try {\n"
" delete p;\n"
" p = new int[123];\n"
" } catch (...) { p = 0; }\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void deallocThrow()
{
check("int * p;\n"
"void f(int x)\n"
"{\n"
" delete p;\n"
" if (x)\n"
" throw 123;\n"
" p = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Throwing exception in invalid state, p points at deallocated memory\n", errout.str());
}
};
REGISTER_TEST(TestExceptionSafety)