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cppcheck/test/testautovariables.cpp

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/*
* Cppcheck - A tool for static C/C++ code analysis
* Copyright (C) 2007-2013 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[], bool inconclusive=false, bool runSimpleChecks=true) {
// Clear the error buffer..
errout.str("");
Settings settings;
settings.inconclusive = inconclusive;
settings.addEnabled("warning");
// Tokenize..
Tokenizer tokenizer(&settings, this);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
CheckAutoVariables checkAutoVariables(&tokenizer, &settings, this);
checkAutoVariables.returnReference();
if (runSimpleChecks) {
const std::string str1(tokenizer.tokens()->stringifyList(0,true));
tokenizer.simplifyTokenList();
const std::string str2(tokenizer.tokens()->stringifyList(0,true));
if (str1 != str2)
warn(("Unsimplified code in test case. It looks like this test "
"should either be cleaned up or moved to TestTokenizer or "
"TestSimplifyTokens instead.\nstr1="+str1+"\nstr2="+str2).c_str());
// Check auto variables
checkAutoVariables.autoVariables();
checkAutoVariables.returnPointerToLocalArray();
}
}
void run() {
TEST_CASE(testautovar1);
TEST_CASE(testautovar2);
TEST_CASE(testautovar3); // ticket #2925
TEST_CASE(testautovar4); // ticket #2928
TEST_CASE(testautovar5); // ticket #2926
TEST_CASE(testautovar6); // ticket #2931
TEST_CASE(testautovar7); // ticket #3066
TEST_CASE(testautovar8);
TEST_CASE(testautovar9);
TEST_CASE(testautovar10); // ticket #2930 - void f(char *p) { p = '\0'; }
TEST_CASE(testautovar11); // ticket #4641 - fp, assign local struct member address to function parameter
TEST_CASE(testautovar_array1);
TEST_CASE(testautovar_array2);
TEST_CASE(testautovar_return1);
TEST_CASE(testautovar_return2);
TEST_CASE(testautovar_return3);
TEST_CASE(testautovar_return4); // ticket #3030
TEST_CASE(testautovar_extern);
TEST_CASE(testinvaliddealloc);
TEST_CASE(testassign1); // Ticket #1819
TEST_CASE(testassign2); // Ticket #2765
TEST_CASE(returnLocalVariable1);
TEST_CASE(returnLocalVariable2);
// return reference..
TEST_CASE(returnReference1);
TEST_CASE(returnReference2);
TEST_CASE(returnReference3);
TEST_CASE(returnReference4);
TEST_CASE(returnReference5);
TEST_CASE(returnReference6);
TEST_CASE(returnReference7);
// global namespace
TEST_CASE(testglobalnamespace);
TEST_CASE(returnParameterAddress);
}
void testautovar1() {
check("void func1(int **res)\n"
"{\n"
" int num = 2;\n"
" *res = &num;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
check("void func1(int **res)\n"
"{\n"
" int num = 2;\n"
" res = &num;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (warning) Assignment of function parameter has no effect outside the function.\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:7]: (error) Address of local auto-variable assigned 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"
" res = &num;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (warning) Assignment of function parameter has no effect outside the function.\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 testautovar3() { // ticket #2925
check("void foo(int **p)\n"
"{\n"
" int x[100];\n"
" *p = x;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
}
void testautovar4() { // ticket #2928
check("void foo(int **p)\n"
"{\n"
" static int x[100];\n"
" *p = x;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testautovar5() { // ticket #2926
check("void foo(struct AB *ab)\n"
"{\n"
" char a;\n"
" ab->a = &a;\n"
"}", false);
ASSERT_EQUALS("", errout.str());
check("void foo(struct AB *ab)\n"
"{\n"
" char a;\n"
" ab->a = &a;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:4]: (error, inconclusive) Address of local auto-variable assigned to a function parameter.\n", errout.str());
}
void testautovar6() { // ticket #2931
check("void foo(struct X *x)\n"
"{\n"
" char a[10];\n"
" x->str = a;\n"
"}", false);
ASSERT_EQUALS("", errout.str());
check("void foo(struct X *x)\n"
"{\n"
" char a[10];\n"
" x->str = a;\n"
"}", true);
ASSERT_EQUALS("[test.cpp:4]: (error, inconclusive) Address of local auto-variable assigned to a function parameter.\n", errout.str());
}
void testautovar7() { // ticket #3066
check("struct txt_scrollpane_s * TXT_NewScrollPane(struct txt_widget_s * target)\n"
"{\n"
" struct txt_scrollpane_s * scrollpane;\n"
" target->parent = &scrollpane->widget;\n"
" return scrollpane;\n"
"}", false);
ASSERT_EQUALS("", errout.str());
}
void testautovar8() {
check("void foo(int*& p) {\n"
" int i = 0;\n"
" p = &i;\n"
"}", false);
ASSERT_EQUALS("[test.cpp:3]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
check("void foo(std::string& s) {\n"
" s = foo;\n"
"}", false);
ASSERT_EQUALS("", errout.str());
}
void testautovar9() {
check("struct FN {int i;};\n"
"struct FP {FN* f};\n"
"void foo(int*& p, FN* p_fp) {\n"
" FN fn;\n"
" FP fp;\n"
" p = &fn.i;\n"
" p = &p_fp->i;\n"
" p = &fp.f->i;\n"
"}", false);
ASSERT_EQUALS("[test.cpp:6]: (error) Address of local auto-variable assigned to a function parameter.\n", errout.str());
}
void testautovar10() { // #2930 - assignment of function parameter
check("void foo(char* p) {\n"
" p = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
check("void foo(int b) {\n"
" b = foo(b);\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
check("void foo(char* p) {\n"
" if (!p) p = buf;\n"
" *p = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(char* p) {\n"
" if (!p) p = buf;\n"
" do_something(p);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(char* p) {\n"
" while (!p) p = buf;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(char* p) {\n"
" p = 0;\n"
" asm(\"somecmd\");\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(Foo* p) {\n"
" p = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:2]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
check("class Foo {};\n"
"void foo(Foo p) {\n"
" p = 0;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (warning) Assignment of function parameter has no effect outside the function.\n", errout.str());
check("void foo(Foo p) {\n"
" p = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("void foo(int& p) {\n"
" p = 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testautovar11() { // #4641 - fp, assign local struct member address to function parameter
check("struct A {\n"
" char *data[10];\n"
"};\n"
"void foo(char** p) {\n"
" struct A a = bar();\n"
" *p = &a.data[0];\n"
"}");
ASSERT_EQUALS("", errout.str());
check("struct A {\n"
" char data[10];\n"
"};\n"
"void foo(char** p) {\n"
" struct A a = bar();\n"
" *p = &a.data[0];\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Address of local auto-variable assigned to a function parameter.\n", 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) Address of local auto-variable assigned 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) Address of local auto-variable assigned 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) Address of an auto-variable returned.\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) Address of an auto-variable returned.\n", errout.str());
}
void testautovar_return3() {
// #2975 - FP
check("void** f()\n"
"{\n"
" void *&value = tls[id];"
" return &value;"
"}");
ASSERT_EQUALS("", errout.str());
}
void testautovar_return4() {
// #3030
check("char *foo()\n"
"{\n"
" char q[] = \"AAAAAAAAAAAA\";\n"
" return &q[1];\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Address of an auto-variable returned.\n", errout.str());
check("char *foo()\n"
"{\n"
" static char q[] = \"AAAAAAAAAAAA\";\n"
" return &q[1];\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testautovar_extern() {
check("struct foo *f()\n"
"{\n"
" extern struct foo f;\n"
" return &f;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testinvaliddealloc() {
check("void func1() {\n"
" char tmp1[256];\n"
" free(tmp1);\n"
" char tmp2[256];\n"
" delete tmp2;\n"
" char tmp3[256];\n"
" delete tmp3;\n"
" char tmp4[256];\n"
" delete[] (tmp4);\n"
" char tmp5[256];\n"
" delete[] tmp5;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Deallocation of an auto-variable results in undefined behaviour.\n"
"[test.cpp:5]: (error) Deallocation of an auto-variable results in undefined behaviour.\n"
"[test.cpp:7]: (error) Deallocation of an auto-variable results in undefined behaviour.\n"
"[test.cpp:9]: (error) Deallocation of an auto-variable results in undefined behaviour.\n"
"[test.cpp:11]: (error) Deallocation of an auto-variable results in undefined behaviour.\n", errout.str());
check("void func1() {\n"
" char* tmp1[256];\n"
" init(tmp1);\n"
" delete tmp1[34];\n"
"}");
ASSERT_EQUALS("", 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"
"}");
ASSERT_EQUALS(std::string(""), errout.str());
}
void testassign1() { // Ticket #1819
check("void f(EventPtr *eventP, ActionPtr **actionsP) {\n"
" EventPtr event = *eventP;\n"
" *actionsP = &event->actions;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void testassign2() { // Ticket #2765
check("static void function(unsigned long **datap) {\n"
" struct my_s *mr = global_structure_pointer;\n"
" *datap = &mr->value;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void returnLocalVariable1() {
check("char *foo()\n"
"{\n"
" char str[100] = {0};\n"
" return str;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Pointer to local array variable returned.\n", errout.str());
check("class Fred {\n"
" char *foo();\n"
"};\n"
"char *Fred::foo()\n"
"{\n"
" char str[100] = {0};\n"
" return str;\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Pointer to local array variable returned.\n", errout.str());
}
void returnLocalVariable2() {
check("std::string foo()\n"
"{\n"
" char str[100] = {0};\n"
" return str;\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"
"}");
ASSERT_EQUALS("", errout.str());
}
void returnReference1() {
check("std::string &foo()\n"
"{\n"
" std::string s;\n"
" return s;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Reference to auto variable returned.\n", errout.str());
check("std::vector<int> &foo()\n"
"{\n"
" std::vector<int> v;\n"
" return v;\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Reference to auto variable returned.\n", errout.str());
check("std::vector<int> &foo()\n"
"{\n"
" static std::vector<int> v;\n"
" return v;\n"
"}");
ASSERT_EQUALS("", errout.str());
check("std::string hello()\n"
"{\n"
" return \"hello\";\n"
"}\n"
"\n"
"std::string &f()\n"
"{\n"
" return hello();\n"
"}");
ASSERT_EQUALS("[test.cpp:8]: (error) Reference to temporary returned.\n", errout.str());
// make sure scope is used in function lookup
check("class Fred {\n"
" std::string hello() {\n"
" return std::string();\n"
" }\n"
"};\n"
"std::string &f() {\n"
" return hello();\n"
"}");
ASSERT_EQUALS("", errout.str());
check("std::string hello() {\n"
" return std::string();\n"
"}\n"
"\n"
"std::string &f() {\n"
" return hello();\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Reference to temporary returned.\n", errout.str());
check("std::string hello() {\n"
" return \"foo\";\n"
"}\n"
"\n"
"std::string &f() {\n"
" return hello().substr(1);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("class Foo;\n"
"Foo hello() {\n"
" return Foo();\n"
"}\n"
"\n"
"Foo& f() {\n"
" return hello();\n"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Reference to temporary returned.\n", errout.str());
// make sure function overloads are handled properly
check("class Foo;\n"
"Foo & hello(bool) {\n"
" static Foo foo;\n"
" return foo;\n"
"}\n"
"Foo hello() {\n"
" return Foo();\n"
"}\n"
"\n"
"Foo& f() {\n"
" return hello(true);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("Foo hello() {\n"
" return Foo();\n"
"}\n"
"\n"
"Foo& f() {\n" // Unknown type - might be a reference
" return hello();\n"
"}");
ASSERT_EQUALS("", 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"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Reference to auto variable returned.\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"
"}");
ASSERT_EQUALS("[test.cpp:7]: (error) Reference to auto variable returned.\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"
"}");
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"
"}");
ASSERT_EQUALS("[test.cpp:10]: (error) Reference to temporary returned.\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"
"}");
ASSERT_EQUALS("[test.cpp:11]: (error) Reference to temporary returned.\n", errout.str());
check("class Bar;\n"
"Bar foo() {\n"
" return something;\n"
"}\n"
"Bar& bar() {\n"
" return foo();\n"
"}");
ASSERT_EQUALS("[test.cpp:6]: (error) Reference to temporary returned.\n", errout.str());
check("std::map<int, string> foo() {\n"
" return something;\n"
"}\n"
"std::map<int, string>& bar() {\n"
" return foo();\n"
"}");
ASSERT_EQUALS("[test.cpp:5]: (error) Reference to temporary returned.\n", errout.str());
check("Bar foo() {\n"
" return something;\n"
"}\n"
"Bar& bar() {\n" // Unknown type - might be a typedef to a reference type
" return foo();\n"
"}");
ASSERT_EQUALS("", errout.str());
// Don't crash with function in unknown scope (#4076)
check("X& a::Bar() {}"
"X& foo() {"
" return Bar();"
"}");
}
void returnReference3() {
check("double & f(double & rd) {\n"
" double ret = getValue();\n"
" rd = ret;\n"
" return rd;\n"
"}", false, false);
ASSERT_EQUALS("", errout.str());
}
// Returning reference to global variable
void returnReference4() {
check("double a;\n"
"double & f() {\n"
" return a;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void returnReference5() {
check("struct A {\n"
" int i;\n"
"};\n"
"struct B {\n"
" A a;\n"
"};\n"
"struct C {\n"
" B *b;\n"
" const A& a() const {\n"
" const B *pb = b;\n"
" const A &ra = pb->a;\n"
" return ra;\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
}
void returnReference6() {
check("Fred & create() {\n"
" Fred &fred(*new Fred);\n"
" return fred;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void returnReference7() { // 3791 - false positive for overloaded function
check("std::string a();\n"
"std::string &a(int);\n"
"std::string &b() {\n"
" return a(12);\n"
"}");
ASSERT_EQUALS("", errout.str());
check("std::string &a(int);\n"
"std::string a();\n"
"std::string &b() {\n"
" return a(12);\n"
"}");
ASSERT_EQUALS("", 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());
}
void returnParameterAddress() {
check("int* foo(int y)\n"
"{\n"
" return &y;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Address of function parameter 'y' returned.\n", errout.str());
check("int ** foo(int * y)\n"
"{\n"
" return &y;\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Address of function parameter 'y' returned.\n", errout.str());
check("const int * foo(const int & y)\n"
"{\n"
" return &y;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
};
REGISTER_TEST(TestAutoVariables)
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