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cppcheck/test/testautovariables.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2011 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[])
{
// Clear the error buffer..
errout.str("");
Settings settings;
settings.debugwarnings = true;
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
CheckAutoVariables checkAutoVariables(&tokenizer, &settings, this);
checkAutoVariables.runChecks(&tokenizer, &settings, this);
tokenizer.simplifyTokenList();
// Assign variable ids
tokenizer.setVarId();
// Fill function list
tokenizer.fillFunctionList();
// Check auto variables
checkAutoVariables.autoVariables();
checkAutoVariables.returnPointerToLocalArray();
checkAutoVariables.returncstr();
}
void run()
{
TEST_CASE(testautovar1);
TEST_CASE(testautovar2);
TEST_CASE(testautovar_array1);
TEST_CASE(testautovar_array2);
TEST_CASE(testautovar_return1);
TEST_CASE(testautovar_return2);
TEST_CASE(testautovar_extern);
TEST_CASE(testinvaliddealloc);
TEST_CASE(testassign); // Ticket #1819
TEST_CASE(returnLocalVariable1);
TEST_CASE(returnLocalVariable2);
// return reference..
TEST_CASE(returnReference1);
TEST_CASE(returnReference2);
TEST_CASE(returnReference3);
// return c_str()..
TEST_CASE(returncstr1);
TEST_CASE(returncstr2);
// global namespace
TEST_CASE(testglobalnamespace);
}
void testautovar1()
{
check("void func1(int **res)\n"
"{\n"
" int num = 2;\n"
" *res = &num;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Assigning address of local auto-variable to a function parameter.\n", errout.str());
check("void func1(int **res)\n"
"{\n"
" int num = 2;\n"
" foo.res = &num;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testautovar2()
{
check("class Fred {\n"
" void func1(int **res);\n"
"}\n"
"void Fred::func1(int **res)\n"
"{\n"
" int num = 2;\n"
" *res = &num;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Assigning address of local auto-variable to a function parameter.\n", errout.str());
check("class Fred {\n"
" void func1(int **res);\n"
"}\n"
"void Fred::func1(int **res)\n"
"{\n"
" int num = 2;\n"
" foo.res = &num;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testautovar_array1()
{
check("void func1(int* arr[2])\n"
"{\n"
" int num=2;"
" arr[0]=&num;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Assigning address of local auto-variable to a function parameter.\n", errout.str());
}
void testautovar_array2()
{
check("class Fred {\n"
" void func1(int* arr[2]);\n"
"}\n"
"void Fred::func1(int* arr[2])\n"
"{\n"
" int num=2;"
" arr[0]=&num;\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Assigning address of local auto-variable to a function parameter.\n", errout.str());
}
void testautovar_return1()
{
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_return2()
{
check("class Fred {\n"
" int* func1()\n"
"}\n"
"int* Fred::func1()\n"
"{\n"
" int num=2;"
" return &num;"
"}");
ASSERT_EQUALS("[test.cpp:6]: (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 testassign()
{
check("void f(EventPtr *eventP, ActionPtr **actionsP) {\n"
" EventPtr event = *eventP;\n"
" *actionsP = &event->actions;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:2]: (error) Assigning address of local auto-variable to a function parameter.\n", 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());
check("class Fred {\n"
" char *foo();\n"
"};\n"
"char *Fred::foo()\n"
"{\n"
" char str[100] = {0};\n"
" return str;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (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());
check("class Fred {\n"
" std::string foo();\n"
"};\n"
"std::string Fred::foo()\n"
"{\n"
" char str[100] = {0};\n"
" return str;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void returnReference1()
{
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 returnReference2()
{
check("class Fred {\n"
" std::string &foo();\n"
"}\n"
"std::string &Fred::foo()\n"
"{\n"
" std::string s;\n"
" return s;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Returning reference to auto variable\n", errout.str());
check("class Fred {\n"
" std::vector<int> &foo();\n"
"};\n"
"std::vector<int> &Fred::foo()\n"
"{\n"
" std::vector<int> v;\n"
" return v;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Returning reference to auto variable\n", errout.str());
check("class Fred {\n"
" std::vector<int> &foo();\n"
"};\n"
"std::vector<int> &Fred::foo()\n"
"{\n"
" static std::vector<int> v;\n"
" return v;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("class Fred {\n"
" std::string &f();\n"
"};\n"
"std::string hello()\n"
"{\n"
" return \"hello\";\n"
"}\n"
"std::string &Fred::f()\n"
"{\n"
" return hello();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Returning reference to temporary\n", errout.str());
check("class Fred {\n"
" std::string hello();\n"
" std::string &f();\n"
"};\n"
"std::string Fred::hello()\n"
"{\n"
" return \"hello\";\n"
"}\n"
"std::string &Fred::f()\n"
"{\n"
" return hello();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:11]: (error) Returning reference to temporary\n", errout.str());
}
void returnReference3()
{
check("double & f(double & rd) {\n"
" double ret = getValue();\n"
" rd = ret;\n"
" return rd;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void returncstr1()
{
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("const char *Foo::f()\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());
}
void returncstr2()
{
check("class Fred {\n"
" const char *foo();\n"
"};\n"
"const char *Fred::foo()\n"
"{\n"
" std::string s;\n"
" return s.c_str();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Returning pointer to auto variable\n", errout.str());
check("class Fred {\n"
" const char *foo();\n"
"};\n"
"const char *Foo::f()\n"
"{\n"
" std::string s;\n"
" return s.c_str();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Returning pointer to auto variable\n", errout.str());
check("class Fred {\n"
" std::string hello();\n"
" const char *f();\n"
"};\n"
"std::string Fred::hello()\n"
"{\n"
" return \"hello\";\n"
"}\n"
"const char *Fred::f()\n"
"{\n"
" return hello().c_str();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:11]: (error) Returning pointer to temporary\n", errout.str());
}
void testglobalnamespace()
{
check("class SharedPtrHolder\n"
"{\n"
" ::std::tr1::shared_ptr<int> pNum;\n"
"public:\n"
" void SetNum(const ::std::tr1::shared_ptr<int> & apNum)\n"
" {\n"
" pNum = apNum;\n"
" }\n"
"}");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestAutoVariables)
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