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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2009 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 "tokenize.h"
#include "checkautovariables.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestAutoVariables : public TestFixture
{
public:
TestAutoVariables() : TestFixture("TestAutoVariables")
{ }
private:
void check(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// Assign variable ids
tokenizer.setVarId();
// Fill function list
tokenizer.fillFunctionList();
// Clear the error buffer..
errout.str("");
// Check auto variables
Settings settings;
CheckAutoVariables checkAutoVariables(&tokenizer, &settings, this);
checkAutoVariables.autoVariables();
checkAutoVariables.returnPointerToLocalArray();
checkAutoVariables.returnReference();
checkAutoVariables.returncstr();
}
void run()
{
TEST_CASE(testautovar);
TEST_CASE(testautovar_array);
TEST_CASE(testautovar_return);
TEST_CASE(testautovar_extern);
TEST_CASE(testinvaliddealloc);
TEST_CASE(returnLocalVariable1);
TEST_CASE(returnLocalVariable2);
// return reference..
TEST_CASE(returnReference);
// return c_str()..
TEST_CASE(returncstr);
}
void testautovar()
{
check("void func1(int **res)\n"
"{\n"
" int num = 2;\n"
" *res = &num;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Wrong assignment of an auto-variable to an effective parameter of a function\n", errout.str());
check("void func1(int **res)\n"
"{\n"
" int num = 2;\n"
" foo.res = &num;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testautovar_array()
{
check("void func1(int* arr[2])\n"
"{\n"
" int num=2;"
" arr[0]=&num;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Wrong assignment of an auto-variable to an effective parameter of a function\n", errout.str());
}
void testautovar_return()
{
check("int* func1()\n"
"{\n"
" int num=2;"
"return &num;}");
ASSERT_EQUALS("[test.cpp:3]: (error) Return of the address of an auto-variable\n", errout.str());
}
void testautovar_extern()
{
check("struct foo *f()\n"
"{\n"
" extern struct foo f;\n"
" return &f;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void testinvaliddealloc()
{
check("int* func1()\n"
"{\n"
"int a;\n"
"char tmp[256];\n"
"free (tmp);\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:5]: (error) Invalid deallocation\n"), errout.str());
check("void f()\n"
"{\n"
" char psz_title[10];\n"
" {\n"
" char *psz_title = 0;\n"
" abc(0, psz_title);\n"
" free(psz_title);\n"
" }\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void returnLocalVariable1()
{
check("char *foo()\n"
"{\n"
" char str[100] = {0};\n"
" return str;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Returning pointer to local array variable\n", errout.str());
}
void returnLocalVariable2()
{
check("std::string foo()\n"
"{\n"
" char str[100] = {0};\n"
" return str;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void returnReference()
{
check("std::string &foo()\n"
"{\n"
" std::string s;\n"
" return s;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Returning reference to auto variable\n", errout.str());
check("std::vector<int> &foo()\n"
"{\n"
" std::vector<int> v;\n"
" return v;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Returning reference to auto variable\n", errout.str());
check("std::vector<int> &foo()\n"
"{\n"
" static std::vector<int> v;\n"
" return v;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("std::string hello()\n"
"{\n"
" return \"hello\";\n"
"}\n"
"\n"
"std::string &f()\n"
"{\n"
" return hello();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Returning reference to temporary\n", errout.str());
}
void returncstr()
{
check("const char *foo()\n"
"{\n"
" std::string s;\n"
" return s.c_str();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Returning pointer to auto variable\n", errout.str());
check("std::string hello()\n"
"{\n"
" return \"hello\";\n"
"}\n"
"\n"
"const char *f()\n"
"{\n"
" return hello().c_str();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Returning pointer to temporary\n", errout.str());
}
};
REGISTER_TEST(TestAutoVariables)
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