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cppcheck/test/testmemleak.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/>.
*/
#include "tokenize.h"
#include "checkmemoryleak.h"
#include "testsuite.h"
#include <sstream>
extern std::ostringstream errout;
class TestLocalLeaks : private TestFixture
{
public:
TestLocalLeaks() : TestFixture("TestLocalLeaks")
{ }
private:
void run()
{
TEST_CASE(test1);
TEST_CASE(test2);
TEST_CASE(test3);
TEST_CASE(test4);
}
void check(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
tokenizer.simplifyTokenList();
// Clear the error buffer..
errout.str("");
// Check for memory leaks..
Settings settings;
CheckMemoryLeakInFunction checkMemoryLeak(&tokenizer, &settings, this);
checkMemoryLeak.localleaks();
}
void test1()
{
check("void foo()\n"
"{\n"
" char *p = new char[100];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: p\n", errout.str());
}
void test2()
{
check("void foo()\n"
"{\n"
" char *p = new char[100];\n"
" delete [] p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void test3()
{
check("void foo(int x)\n"
"{\n"
" char *p = 0;\n"
" if (x == 1)\n"
" p = new char[100];\n"
" if (x == 2)\n"
" delete [] p;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:8]: (error) Memory leak: p\n", errout.str());
}
void test4()
{
check("void foo(int x)\n"
"{\n"
" char *p = 0;\n"
" if (x == 1)\n"
" p = new char[100];\n"
" if (x == 1)\n"
" delete [] p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
static TestLocalLeaks testLocalLeaks;
class TestMemleak : private TestFixture
{
public:
TestMemleak() : TestFixture("TestMemleak")
{ }
private:
void run()
{
TEST_CASE(testFunctionReturnType);
TEST_CASE(open);
}
CheckMemoryLeak::AllocType functionReturnType(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
return ((const CheckMemoryLeak *)0)->functionReturnType(tokenizer.tokens());
}
void testFunctionReturnType()
{
{
const char code[] = "const char *foo()\n"
"{ return 0; }";
ASSERT_EQUALS(CheckMemoryLeak::No, functionReturnType(code));
}
{
const char code[] = "Fred *newFred()\n"
"{ return new Fred; }";
ASSERT_EQUALS(CheckMemoryLeak::New, functionReturnType(code));
}
{
const char code[] = "char *foo()\n"
"{ return new char[100]; }";
ASSERT_EQUALS(CheckMemoryLeak::NewArray, functionReturnType(code));
}
{
const char code[] = "char *foo()\n"
"{\n"
" char *p = new char[100];\n"
" return p;\n"
"}";
ASSERT_EQUALS(CheckMemoryLeak::NewArray, functionReturnType(code));
}
}
void open()
{
const char code[] = "class A {\n"
" static int open() {\n"
" return 1;\n"
" }\n"
"\n"
" A() {\n"
" int ret = open();\n"
" }\n"
"};\n";
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// there is no allocation
const Token *tok = Token::findmatch(tokenizer.tokens(), "ret =");
CheckMemoryLeak check(&tokenizer, 0);
ASSERT_EQUALS(CheckMemoryLeak::No, check.getAllocationType(tok->tokAt(2), 1));
}
};
static TestMemleak testMemleak;
class TestMemleakInFunction : public TestFixture
{
public:
TestMemleakInFunction() : TestFixture("TestMemleakInFunction")
{ }
private:
void check(const char code[], bool showAll = false)
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
tokenizer.simplifyTokenList();
// Clear the error buffer..
errout.str("");
// Check for memory leaks..
Settings settings;
settings.inconclusive = showAll;
tokenizer.fillFunctionList();
CheckMemoryLeakInFunction checkMemoryLeak(&tokenizer, &settings, this);
checkMemoryLeak.check();
}
void run()
{
// Check that getcode works correctly..
TEST_CASE(testgetcode);
// check that call_func works correctly..
TEST_CASE(call_func);
// Check that simplifycode works correctly..
TEST_CASE(simplifycode);
// Check that errors are found..
TEST_CASE(findleak);
TEST_CASE(simple5);
TEST_CASE(simple7);
TEST_CASE(simple9); // Bug 2435468 - member function "free"
TEST_CASE(simple11);
TEST_CASE(new_nothrow);
TEST_CASE(staticvar);
TEST_CASE(externvar);
TEST_CASE(alloc_alloc_1);
TEST_CASE(ifelse6);
TEST_CASE(ifelse7);
TEST_CASE(ifelse8);
TEST_CASE(ifelse9);
TEST_CASE(ifelse10);
TEST_CASE(if4);
TEST_CASE(if7); // Bug 2401436
TEST_CASE(if8); // Bug 2458532
TEST_CASE(if9); // if (realloc)
TEST_CASE(if10); // else if (realloc)
TEST_CASE(if11);
TEST_CASE(forwhile5);
TEST_CASE(forwhile6);
TEST_CASE(forwhile8); // Bug 2429936
TEST_CASE(forwhile9);
TEST_CASE(forwhile10);
TEST_CASE(forwhile11);
TEST_CASE(switch2);
TEST_CASE(switch3);
TEST_CASE(ret5); // Bug 2458436 - return use
TEST_CASE(ret6);
TEST_CASE(ret7);
TEST_CASE(ret8);
TEST_CASE(mismatch1);
TEST_CASE(mismatch2);
TEST_CASE(mismatch3);
TEST_CASE(mismatch4);
TEST_CASE(func3);
TEST_CASE(func4);
TEST_CASE(func5);
TEST_CASE(func6);
TEST_CASE(func7);
TEST_CASE(func9); // Embedding the function call in a if-condition
TEST_CASE(func10); // Bug 2458510 - Function pointer
TEST_CASE(func11); // Bug 2458510 - Function pointer
TEST_CASE(func12);
TEST_CASE(func13);
TEST_CASE(func14);
TEST_CASE(func15);
TEST_CASE(func16);
TEST_CASE(func17);
TEST_CASE(allocfunc1);
TEST_CASE(allocfunc2);
TEST_CASE(throw1);
TEST_CASE(throw2);
TEST_CASE(linux_list_1);
TEST_CASE(sizeof1);
TEST_CASE(realloc1);
TEST_CASE(realloc2);
TEST_CASE(realloc3);
TEST_CASE(realloc4);
TEST_CASE(realloc5);
TEST_CASE(realloc6);
TEST_CASE(assign);
TEST_CASE(varid);
TEST_CASE(cast1);
// Using deallocated memory:
// * It is ok to take the address to deallocated memory
// * It is not ok to dereference a pointer to deallocated memory
TEST_CASE(dealloc_use);
// free a free'd pointer
TEST_CASE(freefree1);
TEST_CASE(freefree2);
TEST_CASE(strcpy_result_assignment);
TEST_CASE(strcat_result_assignment);
TEST_CASE(all1); // Extra checking when --all is given
TEST_CASE(malloc_constant_1); // Check that the malloc constant matches the type
// Calls to unknown functions.. they may throw exception, quit the program, etc
TEST_CASE(unknownFunction1);
TEST_CASE(unknownFunction2);
TEST_CASE(unknownFunction3);
TEST_CASE(unknownFunction4);
TEST_CASE(unknownFunction5);
// VCL..
TEST_CASE(vcl1);
TEST_CASE(vcl2);
// detect leak in class member function..
TEST_CASE(class1);
TEST_CASE(autoptr1);
TEST_CASE(if_with_and);
TEST_CASE(assign_pclose);
// Using the function "exit"
TEST_CASE(exit2);
TEST_CASE(exit4);
TEST_CASE(exit5);
TEST_CASE(noreturn);
TEST_CASE(stdstring);
TEST_CASE(strndup_function);
TEST_CASE(tmpfile_function);
TEST_CASE(fcloseall_function);
TEST_CASE(file_functions);
TEST_CASE(getc_function);
TEST_CASE(open_function);
TEST_CASE(creat_function);
TEST_CASE(close_function);
TEST_CASE(fd_functions);
TEST_CASE(opendir_function);
TEST_CASE(fdopendir_function);
TEST_CASE(closedir_function);
TEST_CASE(dir_functions);
TEST_CASE(pointer_to_pointer);
TEST_CASE(dealloc_and_alloc_in_func);
// Unknown syntax
TEST_CASE(unknownSyntax1);
TEST_CASE(knownFunctions);
TEST_CASE(same_function_name);
}
std::string getcode(const char code[], const char varname[]) const
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
const unsigned int varId(Token::findmatch(tokenizer.tokens(), varname)->varId());
// getcode..
CheckMemoryLeakInFunction checkMemoryLeak(&tokenizer, 0, 0);
checkMemoryLeak.parse_noreturn();
std::list<const Token *> callstack;
callstack.push_back(0);
CheckMemoryLeak::AllocType allocType, deallocType;
allocType = deallocType = CheckMemoryLeak::No;
bool all = false;
Token *tokens = checkMemoryLeak.getcode(tokenizer.tokens(), callstack, varId, allocType, deallocType, false, all, 1);
// stringify..
std::ostringstream ret;
for (const Token *tok = tokens; tok; tok = tok->next())
ret << tok->str();
Tokenizer::deleteTokens(tokens);
return ret.str();
}
void testgetcode()
{
// alloc;
ASSERT_EQUALS(";;alloc;", getcode("int *a = malloc(100);", "a"));
ASSERT_EQUALS(";;alloc;", getcode("int *a = new int;", "a"));
ASSERT_EQUALS(";;alloc;", getcode("int *a = new int[10];", "a"));
ASSERT_EQUALS(";;alloc;", getcode("int * const a = new int[10];", "a"));
ASSERT_EQUALS(";;alloc;", getcode("const int * const a = new int[10];", "a"));
// alloc; return use;
ASSERT_EQUALS(";;alloc;returnuse;", getcode("int *a = new int[10]; return a;", "a"));
ASSERT_EQUALS(";;alloc;returnuse;", getcode("char *a = new char[100]; return (char *)a;", "a"));
// alloc; return;
ASSERT_EQUALS(";;alloc;return;", getcode("char *s = new char[100]; return 0;", "s"));
// lock/unlock..
ASSERT_EQUALS(";;alloc;", getcode("int a; __cppcheck_lock();", ""));
ASSERT_EQUALS(";;callfunc;", getcode("int a; __cppcheck_lock();", "a"));
ASSERT_EQUALS(";;dealloc;", getcode("int a; __cppcheck_unlock();", ""));
ASSERT_EQUALS(";;callfunc;", getcode("int a; __cppcheck_unlock();", "a"));
// dealloc;
ASSERT_EQUALS(";;dealloc;", getcode("char *s; free(s);", "s"));
ASSERT_EQUALS(";;dealloc;", getcode("char *s; free((void *)s);", "s"));
TODO_ASSERT_EQUALS(";;dealloc;", getcode("char *s; free((void *)(s));", "s"));
ASSERT_EQUALS(";;dealloc;", getcode("char *s; free(reinterpret_cast<void *>(s));", "s"));
ASSERT_EQUALS(";;dealloc;", getcode("char *s; delete s;", "s"));
ASSERT_EQUALS(";;dealloc;", getcode("char *s; delete (s);", "s"));
TODO_ASSERT_EQUALS(";;dealloc;", getcode("char *s; delete (void *)(s);", "s"));
ASSERT_EQUALS(";;dealloc;", getcode("char *s; delete [] s;", "s"));
ASSERT_EQUALS(";;dealloc;", getcode("char *s; delete [] (s);", "s"));
ASSERT_EQUALS(";;dealloc;", getcode("void *p; foo(fclose(p));", "p"));
ASSERT_EQUALS(";;dealloc;", getcode("void *p; foo(close(p));", "p"));
// if..
ASSERT_EQUALS(";;if{}", getcode("char *s; if (a) { }", "s"));
ASSERT_EQUALS(";;dealloc;ifv{}", getcode("FILE *f; if (fclose(f)) { }", "f"));
ASSERT_EQUALS(";;if(!var){}else{}", getcode("char *s; if (!s) { } else { }", "s"));
ASSERT_EQUALS(";;if{}", getcode("char *s; if (a && s) { }", "s"));
ASSERT_EQUALS(";;if(!var){}", getcode("char *s; if (a && !s) { }", "s"));
ASSERT_EQUALS(";;ifv{}", getcode("char *s; if (foo(!s)) { }", "s"));
ASSERT_EQUALS(";;;if{dealloc;};if{dealloc;return;}assign;returnuse;", getcode("char *buf, *tmp; tmp = realloc(buf, 40); if (!(tmp)) { free(buf); return; } buf = tmp; return buf;", "buf"));
// switch..
ASSERT_EQUALS(";;switch{case;;break;};", getcode("char *s; switch(a){case 1: break;};", "s"));
// loop..
ASSERT_EQUALS(";;loop{}", getcode("char *s; while (a) { }", "s"));
ASSERT_EQUALS(";;loopcallfunc{}", getcode("char *s; while (a()) { }", "s"));
ASSERT_EQUALS(";;loop{}", getcode("char *s; for (a;b;c) { }", "s"));
ASSERT_EQUALS(";;loop{alloc;}", getcode("char *s; for (a;b;c) { s=malloc(10); }", "s"));
ASSERT_EQUALS(";;do{}loop;", getcode("char *s; do { } while (a);", "s"));
ASSERT_EQUALS(";;while1{}", getcode("char *s; while(true) { }", "s"));
ASSERT_EQUALS(";;while1{}", getcode("char *s; for(;;) { }", "s"));
ASSERT_EQUALS(";;while(var){}", getcode("char *s; while (s) { }", "s"));
ASSERT_EQUALS(";;while(!var){}", getcode("char *s; while (!s) { }", "s"));
ASSERT_EQUALS(";;alloc;while(var){}", getcode("int fd = open(); while (fd >= 0) { }", "fd"));
ASSERT_EQUALS(";;alloc;while(!var){}", getcode("int fd = open(); while (fd < 0) { }", "fd"));
// asprintf..
ASSERT_EQUALS(";;alloc;", getcode("char *s; asprintf(&s, \"xyz\");", "s"));
ASSERT_EQUALS(";;alloc;", getcode("char *s; asprintf(&s, \"s: %s\", s);", "s"));
ASSERT_EQUALS(";;;", getcode("char *s; asprintf(&p, \"s: %s\", s);", "s"));
// Since we don't check how the return value is used we must bail out
ASSERT_EQUALS("", getcode("char *s; int ret = asprintf(&s, \"xyz\");", "s"));
TODO_ASSERT_EQUALS(";;alloc;", getcode("char *s; int ret; ret=asprintf(&s, \"xyz\"); if (ret==-1) return;", "s"));
// use..
ASSERT_EQUALS(";;use;", getcode("char *s; a(s);", "s"));
ASSERT_EQUALS(";;use;", getcode("char *s; (*a)(s);", "s"));
ASSERT_EQUALS(";;use;", getcode("char *s; abc.a(s);", "s"));
ASSERT_EQUALS(";;use;", getcode("char *s; s2 = s;", "s"));
ASSERT_EQUALS(";;use;", getcode("char *s; s2 = s + 10;", "s"));
ASSERT_EQUALS(";;use;", getcode("char *s; s2 = x + s;", "s"));
// return..
ASSERT_EQUALS(";;return;", getcode("char *s; return;", "s"));
ASSERT_EQUALS(";;returnuse;", getcode("char *s; return s;", "s"));
// assign..
ASSERT_EQUALS(";;assign;", getcode("char *s; s = 0;", "s"));
ASSERT_EQUALS(";;;", getcode("char *s; s = strcpy(s, p);", "s"));
// callfunc..
ASSERT_EQUALS(";;assigncallfunc;", getcode("char *s; s = a();", "s"));
ASSERT_EQUALS(";;callfunc;", getcode("char *s; a();", "s"));
ASSERT_EQUALS(";;callfunc;", getcode("char *s; abc.a();", "s"));
// exit..
ASSERT_EQUALS(";;exit;", getcode("char *s; exit(0);", "s"));
ASSERT_EQUALS(";;exit;", getcode("char *s; _exit(0);", "s"));
ASSERT_EQUALS(";;exit;", getcode("char *s; abort();", "s"));
ASSERT_EQUALS(";;exit;", getcode("char *s; err(0);", "s"));
ASSERT_EQUALS(";;if{exit;}", getcode("char *s; if (a) { exit(0); }", "s"));
// list_for_each
ASSERT_EQUALS(";;exit;{}", getcode("char *s; list_for_each(x,y,z) { }", "s"));
// open/close
ASSERT_EQUALS(";;alloc;if(var){dealloc;}", getcode("int f; f=open(); if(f>=0)close(f);", "f"));
ASSERT_EQUALS(";;alloc;ifv{;}", getcode("int f; f=open(); if(f!=-1 || x);", "f"));
ASSERT_EQUALS(";;dealloc;", getcode("int f; e |= fclose(f);", "f"));
// fcloseall..
ASSERT_EQUALS(";;alloc;;", getcode("char *s; s = malloc(10); fcloseall();", "s"));
ASSERT_EQUALS(";;alloc;dealloc;", getcode("FILE *f; f = fopen(a,b); fcloseall();", "f"));
}
void call_func()
{
// whitelist..
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("qsort"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("scanf"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("sscanf"));
// #1293
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("time"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("asctime"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("asctime_r"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("ctime"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("ctime_r"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("gmtime"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("gmtime_r"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("localtime"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("localtime_r"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("memcmp"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("gets"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("vprintf"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("vfprintf"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("vsprintf"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("snprintf"));
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list("vsnprintf"));
static const char * const call_func_white_list[] =
{
"asprintf", "atof", "atoi", "atol", "clearerr", "delete", "fchmod", "fcntl"
, "fdatasync", "feof", "ferror", "fflush", "fgetc", "fgetpos", "fgets"
, "flock", "for", "fprintf", "fputc", "fputs", "fread", "free", "fscanf", "fseek"
, "fseeko", "fsetpos", "fstat", "fsync", "ftell", "ftello", "ftruncate"
, "fwrite", "getc", "if", "ioctl", "lockf", "lseek", "memchr", "memcpy"
, "memmove", "memset", "posix_fadvise", "posix_fallocate", "pread"
, "printf", "puts", "pwrite", "read", "readahead", "readdir", "readdir_r", "readv"
, "realloc", "return", "rewind", "rewinddir", "scandir", "seekdir"
, "setbuf", "setbuffer", "setlinebuf", "setvbuf", "snprintf", "sprintf", "strcasecmp"
, "strcat", "strchr", "strcmp", "strcpy", "stricmp", "strlen", "strncat", "strncmp"
, "strncpy", "strrchr", "strstr", "strtod", "strtol", "strtoul", "switch"
, "sync_file_range", "telldir", "typeid", "while", "write", "writev"
};
for (unsigned int i = 0; i < (sizeof(call_func_white_list) / sizeof(char *)); ++i)
ASSERT_EQUALS(true, CheckMemoryLeakInFunction::test_white_list(call_func_white_list[i]));
}
std::string simplifycode(const char code[], bool &all) const
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
Token *tokens = const_cast<Token *>(tokenizer.tokens());
// replace "if ( ! var )" => "if(!var)"
for (Token *tok = tokens; tok; tok = tok->next())
{
if (Token::Match(tok, "if|while ( var )"))
{
Token::eraseTokens(tok, tok->tokAt(4));
tok->str(tok->str() + "(var)");
}
else if (Token::Match(tok, "if|while ( ! var )"))
{
Token::eraseTokens(tok, tok->tokAt(5));
tok->str(tok->str() + "(!var)");
}
}
Settings settings;
settings.inconclusive = all;
CheckMemoryLeakInFunction checkMemoryLeak(&tokenizer, &settings, NULL);
all = false;
checkMemoryLeak.simplifycode(tokens, all);
std::ostringstream ret;
for (const Token *tok = tokenizer.tokens(); tok; tok = tok->next())
ret << (tok->previous() ? " " : "") << tok->str();
return ret.str();
}
std::string simplifycode(const char code[])
{
bool all = false;
const std::string str1 = simplifycode(code, all);
ASSERT_EQUALS(0, (unsigned int)(all ? 1 : 0));
all = true;
const std::string str2 = simplifycode(code, all);
ASSERT_EQUALS((unsigned int)(all ? 1 : 0), (unsigned int)((str1 != str2) ? 1 : 0));
return all ? (str1 + "\n" + str2) : str1;
}
// Test that the CheckMemoryLeaksInFunction::simplifycode works
void simplifycode()
{
ASSERT_EQUALS(";", simplifycode("; ; ; ;"));
ASSERT_EQUALS(";", simplifycode("; if ;"));
ASSERT_EQUALS("alloc ;", simplifycode("alloc ; if ; if(var) ; ifv ; if(!var) ;"));
ASSERT_EQUALS("alloc ;", simplifycode("alloc ; if ; else ;"));
// if, else..
ASSERT_EQUALS("; alloc ; if break ; dealloc ;", simplifycode("; alloc ; if { break; } dealloc ;"));
ASSERT_EQUALS("; alloc ; if continue ; dealloc ;", simplifycode("; alloc ; if { continue; } dealloc ;"));
ASSERT_EQUALS("; alloc ;", simplifycode("; alloc; if { return use; }"));
ASSERT_EQUALS("; alloc ; dealloc ;", simplifycode("; alloc; if(!var) { return; } dealloc;"));
ASSERT_EQUALS("; alloc ;", simplifycode("; if { alloc; } else { return; }"));
ASSERT_EQUALS("; alloc ; dealloc ;", simplifycode("; alloc ; if(!var) { alloc ; } dealloc ;"));
ASSERT_EQUALS("; use ;", simplifycode("; if(var) use ;"));
ASSERT_EQUALS("; break ;", simplifycode("; if break ; else break ;"));
ASSERT_EQUALS("; alloc ; if return ;", simplifycode("; alloc ; loop { if return ; if continue ; }"));
ASSERT_EQUALS("; alloc ; if return ;", simplifycode("; alloc ; loop { if continue ; else return ; }"));
ASSERT_EQUALS("; alloc ; dealloc ;\n; alloc ;", simplifycode("; alloc ; if(!var) { return ; } if { dealloc ; }"));
ASSERT_EQUALS("; if alloc ; else assign ; return use ;", simplifycode("; callfunc ; if callfunc { alloc ; } else { assign ; } return use ;"));
ASSERT_EQUALS("; dealloc ; return ;", simplifycode("; while1 { if callfunc { dealloc ; return ; } else { continue ; } }"));
// "if ; .."
ASSERT_EQUALS("; if xxx ;", simplifycode("; if ; else xxx ;"));
ASSERT_EQUALS("; if(var) xxx ;", simplifycode("; if(!var) ; else xxx ;"));
ASSERT_EQUALS("; if(!var) xxx ;", simplifycode("; if(var) ; else xxx ;"));
ASSERT_EQUALS("; ifv xxx ;", simplifycode("; ifv ; else xxx ;"));
ASSERT_EQUALS("; alloc ;", simplifycode("; alloc; if { dealloc; return; }"));
ASSERT_EQUALS("; alloc ;", simplifycode("; alloc; if { return use; }"));
ASSERT_EQUALS("; alloc ; return ;", simplifycode(";alloc;if{return;}return;"));
ASSERT_EQUALS("; alloc ; assign ; dealloc ;", simplifycode(";alloc;if{assign;}dealloc;"));
// if(var)
ASSERT_EQUALS("; alloc ; return use ;", simplifycode("; alloc ; return use ;"));
ASSERT_EQUALS("; alloc ; return use ;", simplifycode("; alloc ; ifv return ; return use ;"));
// switch..
ASSERT_EQUALS("; alloc ; dealloc ;", simplifycode(";alloc;switch{case;break;};dealloc;"));
ASSERT_EQUALS("; if return ;", simplifycode("; switch { case ; return ; default ; break ; }"));
ASSERT_EQUALS("; if return ;", simplifycode("; switch { case ; if { return ; } break ; default ; break ; }"));
ASSERT_EQUALS("; if return ; else use ;", simplifycode("; switch { case ; return ; default ; use ; break ; }"));
ASSERT_EQUALS("; use ;", simplifycode("; while1 { loop { ; } switch { case ; dealloc ; return ; default ; break ; } }"));
// loops..
ASSERT_EQUALS(";", simplifycode("; loop { ; }"));
ASSERT_EQUALS(";", simplifycode("; loop { break; }"));
ASSERT_EQUALS(";", simplifycode("; loop { if { break; } }"));
ASSERT_EQUALS("; loop alloc ;", simplifycode("; loop { alloc ; }"));
ASSERT_EQUALS("; alloc ; alloc ;", simplifycode("; alloc ; do { alloc ; } loop ;"));
ASSERT_EQUALS("; exit ;", simplifycode("; alloc ; do { } loop ; exit ;"));
ASSERT_EQUALS("; alloc ;", simplifycode("; alloc ; while(!var) alloc ;"));
ASSERT_EQUALS("; alloc ; dealloc ; return ;", simplifycode("; alloc ; while1 { if { dealloc ; return ; } }"));
ASSERT_EQUALS("; alloc ; dealloc ; return ;", simplifycode("; alloc ; while1 { if { dealloc ; return ; } if { continue ; } }"));
ASSERT_EQUALS("; alloc ;", simplifycode("; alloc ; while1 { if { dealloc ; return ; } if { break ; } }"));
ASSERT_EQUALS(";", simplifycode("; do { dealloc ; alloc ; } while(var) ;"));
// callfunc..
ASSERT_EQUALS("; callfunc ;\n;", simplifycode(";callfunc;"));
// exit..
ASSERT_EQUALS("; exit ;", simplifycode("; alloc; exit;"));
ASSERT_EQUALS("; exit ;", simplifycode("; alloc; if { loop ; } dealloc; exit;"));
ASSERT_EQUALS(";", simplifycode("; if { alloc; exit; }"));
ASSERT_EQUALS("; alloc ;", simplifycode("; alloc ; if { use; exit; }"));
ASSERT_EQUALS("; alloc ;", simplifycode("; alloc ; if(!var) { exit; }"));
TODO_ASSERT_EQUALS(";", simplifycode("; alloc ; if(var) { exit; }"));
TODO_ASSERT_EQUALS(";\n; alloc ;", simplifycode("; alloc ; ifv { exit; }"));
// dealloc; dealloc;
ASSERT_EQUALS("; alloc ; dealloc ; dealloc ;", simplifycode("; alloc ; if { dealloc ; } dealloc ;"));
}
// is there a leak in given code? if so, return the linenr
unsigned int dofindleak(const char code[], bool all = false) const
{
// Tokenize..
Settings settings;
settings._debug = true;
Tokenizer tokenizer(&settings, NULL);
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
// replace "if ( ! var )" => "if(!var)"
for (Token *tok = const_cast<Token *>(tokenizer.tokens()); tok; tok = tok->next())
{
if (tok->str() == "if_var")
{
tok->str("if(var)");
}
else if (Token::simpleMatch(tok, "if ( var )"))
{
Token::eraseTokens(tok, tok->tokAt(4));
tok->str("if(var)");
}
else if (Token::simpleMatch(tok, "if ( ! var )"))
{
Token::eraseTokens(tok, tok->tokAt(5));
tok->str("if(!var)");
}
}
const Token *tok = CheckMemoryLeakInFunction::findleak(tokenizer.tokens(), all);
return (tok ? tok->linenr() : (unsigned int)(-1));
}
void findleak()
{
static const unsigned int notfound = (unsigned int)(-1);
ASSERT_EQUALS(1, dofindleak("alloc;"));
ASSERT_EQUALS(1, dofindleak("; use; { alloc; }"));
ASSERT_EQUALS(2, dofindleak("alloc;\n return;"));
ASSERT_EQUALS(notfound, dofindleak("alloc; return use;"));
ASSERT_EQUALS(2, dofindleak("alloc;\n callfunc;"));
ASSERT_EQUALS(notfound, dofindleak("alloc; use;"));
ASSERT_EQUALS(notfound, dofindleak("assign; alloc; dealloc;"));
ASSERT_EQUALS(notfound, dofindleak("assign; if alloc; dealloc;"));
// if alloc..
ASSERT_EQUALS(2, dofindleak("if alloc;\n return;"));
ASSERT_EQUALS(notfound, dofindleak("if alloc;\n return use;"));
ASSERT_EQUALS(notfound, dofindleak("if alloc;\n use;"));
// if..
ASSERT_EQUALS(notfound, dofindleak("alloc; ifv dealloc;"));
ASSERT_EQUALS(2, dofindleak("alloc;\n if return;\n dealloc;"));
ASSERT_EQUALS(2, dofindleak("alloc;\n if continue;\n dealloc;"));
ASSERT_EQUALS(2, dofindleak("alloc;\n if_var return;\n dealloc;"));
ASSERT_EQUALS(3, dofindleak("alloc;\n if\n return;\n dealloc;"));
ASSERT_EQUALS(notfound, dofindleak("alloc; if { dealloc ; return; } dealloc;"));
ASSERT_EQUALS(notfound, dofindleak("alloc; if { dealloc ; return; } dealloc;"));
ASSERT_EQUALS(notfound, dofindleak("alloc; if { dealloc ; alloc; } dealloc;"));
ASSERT_EQUALS(notfound, dofindleak("alloc;\n if(!var)\n { callfunc;\n return;\n }\n use;"));
ASSERT_EQUALS(notfound, dofindleak("alloc; if { return use; } dealloc;"));
ASSERT_EQUALS(notfound, dofindleak("alloc; if { dealloc; return; } dealloc;"));
// assign..
ASSERT_EQUALS(2, dofindleak("alloc;\n assign;\n dealloc;"));
ASSERT_EQUALS(notfound, dofindleak("alloc;\n if(!var) assign;\n dealloc;"));
ASSERT_EQUALS(2, dofindleak("alloc;\n if assign;\n dealloc;"));
// loop..
TODO_ASSERT_EQUALS(1, dofindleak("; loop { alloc ; if break; dealloc ; }"));
TODO_ASSERT_EQUALS(1, dofindleak("; loop { alloc ; if continue; dealloc ; }"));
ASSERT_EQUALS(notfound, dofindleak("; loop { alloc ; if break; } dealloc ;"));
ASSERT_EQUALS(1, dofindleak("; loop alloc ;"));
ASSERT_EQUALS(1, dofindleak("; loop alloc ; dealloc ;"));
// Todo..
ASSERT_EQUALS(notfound, dofindleak("; alloc;\n if { dealloc; }\n ;"));
TODO_ASSERT_EQUALS(3, dofindleak("; alloc;\n if { dealloc; }\n ;"));
}
void simple5()
{
check("static char *f()\n"
"{\n"
" struct *str = new strlist;\n"
" return &str->s;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void simple7()
{
// A garbage collector may delete f automaticly
check("class Fred;\n"
"void foo()\n"
"{\n"
" Fred *f = new Fred;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void simple9()
{
check("void foo()\n"
"{\n"
" MyClass *c = new MyClass();\n"
" c->free(c);\n"
" delete c;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void simple11()
{
check("void Fred::aaa()\n"
"{ }\n"
"\n"
"void Fred::foo()\n"
"{\n"
" char *s = NULL;\n"
" if (a)\n"
" s = malloc(10);\n"
" else if (b)\n"
" s = malloc(10);\n"
" else\n"
" f();\n"
" g(s);\n"
" if (c)\n"
" h(s);\n"
" free(s);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void new_nothrow()
{
check("void f()\n"
"{\n"
" int *p = new(std::nothrow) int;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: p\n", errout.str());
check("void f()\n"
"{\n"
" using std::nothrow;\n"
" int *p = new(nothrow) int;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: p\n", errout.str());
check("void f()\n"
"{\n"
" int *p = new(std::nothrow) int[10];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: p\n", errout.str());
check("void f()\n"
"{\n"
" using namespace std;\n"
" int *p = new(nothrow) int[10];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: p\n", errout.str());
check("void f()\n"
"{\n"
" int *p = new(std::nothrow) int;\n"
" delete [] p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Mismatching allocation and deallocation: p\n", errout.str());
check("void f()\n"
"{\n"
" int *p = new(std::nothrow) int[10];\n"
" delete p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Mismatching allocation and deallocation: p\n", errout.str());
}
void staticvar()
{
check("int f()\n"
"{\n"
" static char *s = 0;\n"
" free(s);\n"
" s = malloc(100);\n"
" return 123;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void externvar()
{
check("void f()\n"
"{\n"
" extern char *s;\n"
" s = malloc(100);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void alloc_alloc_1()
{
check("void foo()\n"
"{\n"
" char *str;\n"
" str = new char[10];\n"
" str = new char[20];\n"
" delete [] str;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: str\n", errout.str());
}
void ifelse6()
{
check("static char *f()\n"
"{\n"
" char *s = new char[100];\n"
" if ( a == b )\n"
" {\n"
" return s;\n"
" }\n"
" return NULL;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Memory leak: s\n", errout.str());
}
void ifelse7()
{
check("static char *f()\n"
"{\n"
" char *s;\n"
" if ( abc )\n"
" {\n"
" s = new char[10];\n"
" }\n"
" return s;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ifelse8()
{
check("static char *f()\n"
"{\n"
" char *s = new char[10];\n"
" if ( s )\n"
" {\n"
" return s;\n"
" }\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ifelse9()
{
check("static char *f()\n"
"{\n"
" char *s = new char[10];\n"
" if ( ghfgf )\n"
" {\n"
" delete [] s;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ifelse10()
{
check("static char *f()\n"
"{\n"
" char *s = new char[10];\n"
" if ( ghfgf )\n"
" {\n"
" str[0] = s;\n"
" }\n"
" else\n"
" {\n"
" str[0] = s;\n"
" }\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void if4()
{
check("void f()\n"
"{\n"
" char *s;\n"
" bool b = true;\n"
" if (b && (s = malloc(256)))\n"
" ;\n"
" if (b)\n"
" free(s);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void if7()
{
check("void f( bool b )\n"
"{\n"
" int *a=0;\n"
" if( b )\n"
" {\n"
" a = new int[10];\n"
" }\n"
"\n"
" if( b )\n"
" delete [] a;\n"
" else {}\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void if8()
{
check("static void f(int i)\n"
"{\n"
" char *c = malloc(50);\n"
" if (i == 1)\n"
" {\n"
" free(c);\n"
" return;\n"
" }\n"
" if (i == 2)\n"
" {\n"
" return;\n"
" }\n"
" free(c);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:11]: (error) Memory leak: c\n", errout.str());
}
void if9()
{
check("static void f()\n"
"{\n"
" char *buf = NULL, *tmp;\n"
" if (!(tmp = realloc(buf, 50)))\n"
" {\n"
" free(buf);\n"
" return NULL;\n"
" }\n"
" buf = tmp;\n"
" return buf;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void if10()
{
check("static void f()\n"
"{\n"
" char *buf = malloc(10);\n"
" if (aa)\n"
" ;\n"
" else if (buf = realloc(buf, 100))\n"
" ;\n"
" free(buf);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Memory leak: buf\n", errout.str());
}
void if11()
{
check("void foo()\n"
"{\n"
" int *x = new int[10];\n"
" if (x == 0 || aa)\n"
" {\n"
" return 1;\n"
" }\n"
" delete [] x;\n"
"}\n", true);
TODO_ASSERT_EQUALS("[test.cpp:6]: (error) Memory leak: x\n", errout.str());
}
void forwhile5()
{
check("void f(const char **a)\n"
"{\n"
" char *str = 0;\n"
" for (int i = 0; i < 10 && !str; ++i)\n"
" {\n"
" str = strdup(a[i]);\n"
" }\n"
" return str;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void forwhile6()
{
check("void f(const char **a)\n"
"{\n"
" char *str = 0;\n"
" for (int i = 0; i < 10 && !str; ++i)\n"
" {\n"
" str = strdup(a[i]);\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Memory leak: str\n", errout.str());
}
void forwhile8()
{
check("char *f()\n"
"{\n"
" char *a = 0;\n"
" int i = 0;\n"
" for( ;; )\n"
" {\n"
" ++i;\n"
" a = realloc( a, i );\n"
" if( !a )\n"
" return 0;\n"
"\n"
" if( i > 10 )\n"
" break;\n"
" }\n"
"\n"
" return a;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:10]: (error) Memory leak: a\n", errout.str());
}
void forwhile9()
{
check("char *f()\n"
"{\n"
" char *a = 0;\n"
" int i = 0;\n"
" for(i = 0 ;i < 50 ; i++)\n"
" {\n"
" if(func1(i))\n"
" continue;\n"
" a = realloc( a, i );\n"
" if(func2(i))\n"
" continue;\n"
" }\n"
"\n"
" return a;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void forwhile10()
{
check("char *f()\n"
"{\n"
" char *a = 0;\n"
" int i = 0;\n"
" for(i = 0; i < 50; i++)\n"
" {\n"
" if(func1(i))\n"
" continue;\n"
" a = realloc( a, i );\n"
" if(func2(i))\n"
" return;\n"
" }\n"
"\n"
" return a;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:11]: (error) Memory leak: a\n", errout.str());
}
void forwhile11()
{
check("int main()\n"
"{\n"
" FILE *stream=NULL;\n"
" while((stream = fopen(name,\"r\")) == NULL)\n"
" { }\n"
" if(stream!=NULL) fclose(stream);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void switch2()
{
const std::string code("void f()\n"
"{\n"
" char *str = new char[10];\n"
" switch (abc)\n"
" {\n"
" case 1:\n"
" delete [] str;\n"
" break;\n"
" default:\n"
" break;\n"
" };\n"
"}\n");
check(code.c_str(), false);
ASSERT_EQUALS("", errout.str());
check(code.c_str(), true);
ASSERT_EQUALS("[test.cpp:12]: (possible error) Memory leak: str\n", errout.str());
}
void switch3()
{
check("void f()\n"
"{\n"
" char *str = new char[10];\n"
" while (abc)\n"
" {\n"
" switch (def)\n"
" {\n"
" default:\n"
" return;\n"
" }\n"
" }\n"
" delete [] str;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9]: (error) Memory leak: str\n", errout.str());
}
void ret5()
{
check("static char * f()\n"
"{\n"
" char *c = new char[50];\n"
" return (c ? c : NULL);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ret6()
{
check("void foo()\n"
"{\n"
" char *c = new char[50];\n"
" return strcpy(c, \"foo\");\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ret7()
{
check("void foo()\n"
"{\n"
" char *c = new char[50];\n"
" return memcpy(c, \"foo\",4);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ret8()
{
check("char *foo()\n"
"{\n"
" char *c = new char[50];\n"
" return ((char *)(c+1));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void mismatch1()
{
check("void f()\n"
"{\n"
" int *a = new int[10];\n"
" free(a);\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:4]: (error) Mismatching allocation and deallocation: a\n", errout.str());
}
void mismatch2()
{
check("void f()\n"
"{\n"
" FILE *fp;\n"
"\n"
" fp = fopen();\n"
" fclose(fp);\n"
"\n"
" fp = popen();\n"
" pclose(fp);\n"
"}\n", false);
ASSERT_EQUALS("", errout.str());
}
void mismatch3()
{
check("void f()\n"
"{\n"
" FILE *fp;\n"
"\n"
" if (abc) fp = fopen();\n"
" else fp = popen();\n"
"\n"
" if (abc) fclose(fp);\n"
" else pclose(fp);\n"
"}\n", false);
ASSERT_EQUALS("", errout.str());
}
void mismatch4()
{
check("void f()\n"
"{\n"
" char *p = 0;\n"
" for (i = 0; i < 10; ++i)\n"
" {\n"
" delete p;\n"
" p = new char[100];\n"
" }\n"
" delete [] p;\n"
"}\n", false);
ASSERT_EQUALS("[test.cpp:7]: (error) Mismatching allocation and deallocation: p\n", errout.str());
}
////////////////////////////////////////////////
// function calls
////////////////////////////////////////////////
void func3()
{
check("static void foo(const char *str)\n"
"{ }\n"
"\n"
"static void f()\n"
"{\n"
" char *p = new char[100];\n"
" foo(p);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Memory leak: p\n", errout.str());
}
void func4()
{
check("static void foo(char *str)\n"
"{\n"
" delete [] str;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char *p = new char[100];\n"
" foo(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void func5()
{
check("static void foo(char *str)\n"
"{\n"
" delete str;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char *p = new char[100];\n"
" foo(p);\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:9] -> [test.cpp:3]: (error) Mismatching allocation and deallocation: str\n",
errout.str());
}
void func6()
{
check("static void foo(char *str)\n"
"{\n"
" goto abc;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char *p = new char[100];\n"
" foo(p);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Memory leak: p\n", errout.str());
}
void func7()
{
check("static void foo(char *str)\n"
"{\n"
" if (abc)\n"
" return;"
" delete [] str;\n"
"}\n"
"\n"
"static void f()\n"
"{\n"
" char *p = new char[100];\n"
" foo(p);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:11]: (error) Memory leak: p\n", errout.str());
}
void func9()
{
check("int b()\n"
"{\n"
" return 0;\n"
"}\n"
"\n"
"void a()\n"
"{\n"
" char *a = new char[10];\n"
" if (b())\n"
" return;\n"
" delete [] a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void func10()
{
check("static void f(void (*fnc)(char*))\n"
"{\n"
" char *c = malloc(50);\n"
" (fnc)(c);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void func11()
{
check("static void f(struct1 *s1)\n"
"{\n"
" char *c = malloc(50);\n"
" (s1->fnc)(c);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void func12()
{
check("void add_list(struct mmtimer *n)\n"
"{\n"
" rb_link_node(&n->list, parent, link);\n"
"}\n"
"\n"
"int foo()\n"
"{\n"
" struct mmtimer *base;\n"
"\n"
" base = kmalloc(sizeof(struct mmtimer), GFP_KERNEL);\n"
" if (base == NULL)\n"
" return -ENOMEM;\n"
"\n"
" add_list(base);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void func13()
{
check("static void f()\n"
"{\n"
" char *p = malloc(100);\n"
" foo(&p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void func14()
{
// It is not known what the "foo" that only takes one parameter does..
check("static void foo(char *a, char *b)\n"
"{\n"
" free(a);\n"
" free(b);\n"
"}\n"
"static void f()\n"
"{\n"
" char *p = malloc(100);\n"
" foo(p);\n"
" free(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void func15()
{
check("static void a()\n"
"{ return true; }\n"
"\n"
"static void b()\n"
"{\n"
" char *p = malloc(100);\n"
" if (a()) return;\n" // <- memory leak
" free(p);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Memory leak: p\n", errout.str());
}
void func16()
{
check("static void a( bo_t *p_bo)\n"
"{\n"
" p_bo->buffer = realloc( p_bo->buffer, 100 );\n"
"}\n"
"\n"
"static bo_t * b()\n"
"{\n"
" bo_t *box;\n"
" if( ( box = malloc( sizeof( bo_t ) ) ) )\n"
" {\n"
" a(box);\n"
" a(box);\n"
" }\n"
" return box;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void func17()
{
// The "bar" function must be reduced to "use"
check("bool bar(char **parent, char *res, bool a)\n"
"{\n"
" if( a )\n"
" {\n"
" *parent = res;\n"
" return false;\n"
" }\n"
" return true;\n"
"}\n"
"\n"
"void foo(char **parent, bool a)\n"
"{\n"
" if (a)\n"
" {\n"
" char *res = malloc(65);\n"
" bar(parent, res, a);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void allocfunc1()
{
check("static char *a()\n"
"{\n"
" return new char[100];\n"
"}\n"
"static void b()\n"
"{\n"
" char *p = a();\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:8]: (error) Memory leak: p\n"), errout.str());
check("FILE *a()\n"
"{\n"
" return fopen(\"test.txt\",\"w\");\n"
"}\n"
"static void b()\n"
"{\n"
" FILE *p = a();\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:8]: (error) Memory leak: p\n"), errout.str());
check("char *a()\n"
"{\n"
" return malloc(10);\n"
"}\n"
"static void b()\n"
"{\n"
" char *p = a();\n"
"}\n");
ASSERT_EQUALS(std::string("[test.cpp:8]: (error) Memory leak: p\n"), errout.str());
}
void allocfunc2()
{
check("static char *a(int size)\n"
"{\n"
" return new char[size];\n"
"}\n"
"static void b()\n"
"{\n"
" int len = 100;\n"
" char *p = a(len);\n"
" delete [] p;\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
check("char *a(char *a)\n"
"{\n"
" return realloc(a, 10);\n"
"}\n"
"static void b()\n"
"{\n"
" char *p = a(0);\n"
" char *p = a(p);\n"
" free(p);\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
check("char *a()\n"
"{\n"
" return malloc(10);\n"
"}\n"
"static void b()\n"
"{\n"
" char *p = a();\n"
" free(p);\n"
"}\n");
ASSERT_EQUALS(std::string(""), errout.str());
}
void throw1()
{
check("void foo()\n"
"{\n"
" char *str = new char[10];\n"
" if ( ! abc )\n"
" throw 123;\n"
" delete [] str;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: str\n", errout.str());
}
void throw2()
{
check("void foo()\n"
"{\n"
" char *str = 0;\n"
" try\n"
" {\n"
" str = new char[100];\n"
" if ( somecondition )\n"
" throw exception;\n"
" delete [] str;\n"
" }\n"
" catch ( ... )\n"
" {\n"
" delete [] str;\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void linux_list_1()
{
check("struct AB\n"
"{\n"
" int a;\n"
" int b;\n"
"};\n"
"void foo()\n"
"{\n"
" struct AB *ab = new AB;\n"
" func(&ab->a);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void sizeof1()
{
check("void f()\n"
"{\n"
" struct s_t s1;\n"
" struct s_t cont *p = &s1;\n"
" struct s_t *s2;\n"
"\n"
" memset(p, 0, sizeof(*p));\n"
"\n"
" s2 = (struct s_t *) malloc(sizeof(*s2));\n"
"\n"
" if (s2->value != 0)\n"
" return;\n"
"\n"
" free(s2);\n"
"\n"
" return;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:12]: (error) Memory leak: s2\n", errout.str());
}
void realloc1()
{
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" a = realloc(a, 100);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: a\n", errout.str());
}
void realloc2()
{
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" a = (char *)realloc(a, 100);\n"
" free(a);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: a\n", errout.str());
}
void realloc3()
{
check("void foo()\n"
"{\n"
" char *a = 0;\n"
" if ((a = realloc(a, 100)) == NULL)\n"
" return;\n"
" free(a);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void realloc4()
{
check("void foo()\n"
"{\n"
" static char *a = 0;\n"
" if ((a = realloc(a, 100)) == NULL)\n"
" return;\n"
" free(a);\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: a\n", errout.str());
}
void realloc5()
{
check("void foo()\n"
"{\n"
" char *buf;\n"
" char *new_buf;\n"
" buf = calloc( 10 );\n"
" new_buf = realloc ( buf, 20);\n"
" if ( !new_buf )\n"
" free(buf);\n"
" else\n"
" free(new_buf);\n"
"}\n", true);
// There isn't a memory leak in the code
TODO_ASSERT_EQUALS("", errout.str());
// This assertion checks that the message stays the same. Upon changes in the error message
// we will be notified
ASSERT_EQUALS("[test.cpp:11]: (possible error) Memory leak: buf\n", errout.str());
}
void realloc6()
{
ASSERT_EQUALS(";;realloc;;", getcode("char *buf; buf=realloc(buf,100);", "buf"));
ASSERT_EQUALS(";;alloc;", getcode("char *buf; buf=realloc(0,100);", "buf"));
}
void assign()
{
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" a = 0;\n"
" free(a);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: a\n", errout.str());
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" char *p = a;\n"
" free(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" char *p = a + 1;\n"
" free(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" a += 10;\n"
" free(a - 10);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" char *a = (char *)malloc(10);\n"
" a = (void *)a + 10;\n"
" free(a - 10);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" char *a = new char[100];\n"
" list += a;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void varid()
{
check("void foo()\n"
"{\n"
" char *p = malloc(100);\n"
" {\n"
" char *p = 0;\n"
" delete p;\n"
" }\n"
" free(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void cast1()
{
check("void foo()\n"
"{\n"
" char *a = reinterpret_cast<char *>(malloc(10));\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: a\n", errout.str());
}
void dealloc_use()
{
// It is ok to take the address..
check("void f()\n"
"{\n"
" char *s = new char[100];\n"
" delete [] s;\n"
" p = s;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char *s = new char[100];\n"
" delete [] s;\n"
" foo(s);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// The pointer to the pointer is valid..
check("void f()\n"
"{\n"
" char *str;\n"
" free(str);\n"
" foo(&str);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" char *str = 0;\n"
" free(str);\n"
" f1(&str);\n"
" f2(str);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
// Dereferencing the freed pointer is not ok..
check("void foo()\n"
"{\n"
" char *str = malloc(10);\n"
" free(str);\n"
" char c = *str;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:5]: (error) Dereferencing 'str' after it is deallocated / released\n", errout.str());
check("void foo()\n"
"{\n"
" char *str = malloc(10);\n"
" free(str);\n"
" char c = str[10];\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Dereferencing 'str' after it is deallocated / released\n", errout.str());
check("void foo()\n"
"{\n"
" char *str = malloc(10);\n"
" free(str);\n"
" str[10] = 0;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Dereferencing 'str' after it is deallocated / released\n", errout.str());
}
void freefree1()
{
check("void foo()\n"
"{\n"
" char *str = malloc(100);\n"
" free(str);\n"
" free(str);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Deallocating a deallocated pointer: str\n", errout.str());
}
void freefree2()
{
check("void foo()\n"
"{\n"
" FILE *fd = fopen(\"test.txt\", \"wb\");\n"
" fprintf(fd, \"test\");\n"
" fclose(fd);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void strcpy_result_assignment()
{
check("void foo()\n"
"{\n"
" char *p1 = malloc(10);\n"
" char *p2 = strcpy(p1, \"a\");\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void strcat_result_assignment()
{
check("void foo()\n"
"{\n"
" char *p = malloc(10);\n"
" p[0] = 0;\n"
" p = strcat( p, \"a\" );\n"
" free( p );\n"
" return 0;\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void all1()
{
check("void foo()\n"
"{\n"
" Fred *f = new Fred;\n"
"}\n", false);
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" Fred *f = new Fred;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:4]: (possible error) Memory leak: f\n", errout.str());
}
void malloc_constant_1()
{
check("void foo()\n"
"{\n"
" int *p = malloc(3);\n"
" free(p);\n"
"}\n", false);
ASSERT_EQUALS("[test.cpp:3]: (error) The given size 3 is mismatching\n", errout.str());
}
void unknownFunction1()
{
check("void foo()\n"
"{\n"
" int *p = new int[100];\n"
" if (abc)\n"
" {\n"
" delete [] p;\n"
" ThrowException();\n"
" }\n"
" delete [] p;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void unknownFunction2()
{
check("void foo()\n"
"{\n"
" int *p = new int[100];\n"
" if (abc)\n"
" {\n"
" delete [] p;\n"
" ThrowException();\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:9]: (error) Memory leak: p\n", errout.str());
check("void foo()\n"
"{\n"
" int *p = new int[100];\n"
" p = g();\n"
" delete [] p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: p\n", errout.str());
}
void unknownFunction3()
{
check("void foo()\n"
"{\n"
" int *p = new int[100];\n"
" ThrowException();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: p\n", errout.str());
}
void unknownFunction4()
{
check("void foo()\n"
"{\n"
" int *p = new int[100];\n"
" a();\n"
" if (b) return;\n"
" delete [] p;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: p\n", errout.str());
}
void unknownFunction5()
{
check("static void foo()\n"
"{\n"
" char *p = NULL;\n"
"\n"
" if( a )\n"
" p = malloc(100);\n"
"\n"
" if( a )\n"
" {\n"
" FREENULL(p);\n"
" FREENULL();\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void checkvcl(const char code[], const char _autoDealloc[])
{
// Tokenize..
Tokenizer tokenizer;
{
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
}
tokenizer.setVarId();
tokenizer.simplifyTokenList();
// Clear the error buffer..
errout.str("");
// Check for memory leaks..
Settings settings;
settings.inconclusive = true;
{
std::istringstream istr(_autoDealloc);
settings.autoDealloc(istr);
}
CheckMemoryLeakInFunction checkMemoryLeak(&tokenizer, &settings, this);
checkMemoryLeak.check();
}
void vcl1()
{
checkvcl("void Form1::foo()\n"
"{\n"
" TEdit *Edit1 = new TEdit(this);\n"
"}\n", "TEdit\n");
ASSERT_EQUALS("", errout.str());
}
void vcl2()
{
checkvcl("class Fred\n"
"{\n"
"private:\n"
" TButton *button;\n"
"public:\n"
" Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{\n"
" button = new TButton(this);\n"
"}\n", "TButton\n");
ASSERT_EQUALS("", errout.str());
}
void class1()
{
check("class Fred\n"
"{\n"
"public:\n"
" Fred()\n"
" {\n"
" int *p = new int[100];\n"
" }\n"
"};\n");
ASSERT_EQUALS("[test.cpp:7]: (error) Memory leak: p\n", errout.str());
}
void autoptr1()
{
check("std::auto_ptr<int> foo()\n"
"{\n"
" int *i = new int;\n"
" return std::auto_ptr<int>(i);\n"
"}");
ASSERT_EQUALS("", errout.str());
}
void if_with_and()
{
check("void f()\n"
"{\n"
" char *a = new char[10];\n"
" if (!a && b() )\n"
" return;\n"
"\n"
" delete [] a;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char *a = new char[10];\n"
" if (b() && !a )\n"
" return;\n"
"\n"
" delete [] a;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void assign_pclose()
{
check("void f()\n"
"{\n"
" FILE *f = popen (\"test\", \"w\");\n"
" int a = pclose(f);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void exit2()
{
check("void f()\n"
"{\n"
" char *out = new char[100];\n"
" exit(0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" char *out = new char[100];\n"
" if( out ) {}\n"
" exit(0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void exit4()
{
check("void f()\n"
"{\n"
" char *p = malloc(100);\n"
" if (x)\n"
" {\n"
" exit(0);\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Memory leak: p\n", errout.str());
}
void exit5()
{
check("void f()\n"
"{\n"
" char *p = malloc(100);\n"
" if (p)\n"
" {\n"
" xyz();\n"
" exit(0);\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void exit6()
{
check("int main(int argc, char *argv[]) {\n"
" FILE *sfile;\n"
" unsigned long line;\n"
" sfile = fopen(\"bar\", \"r\");\n"
" if (!sfile)\n"
" return 1;\n"
" for(line = 0; ; line++) {\n"
" if (argc > 3)\n"
" break;\n"
" exit(0);\n"
" }\n"
" fclose(sfile);\n"
" exit(0);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void noreturn()
{
check("void fatal_error()\n"
"{ exit(1); }\n"
"\n"
"void f()\n"
"{\n"
" char *p = malloc(100);\n"
" fatal_error();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void stdstring()
{
check("void f(std::string foo)\n"
"{\n"
" char *out = new char[11];\n"
" memset(&(out[0]), 0, 1);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: out\n", errout.str());
}
void strndup_function()
{
check("void f()\n"
"{\n"
" char *out = strndup(\"text\", 3);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Memory leak: out\n", errout.str());
}
void tmpfile_function()
{
check("void f()\n"
"{\n"
" FILE *f = tmpfile();\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Resource leak: f\n", errout.str());
check("void f()\n"
"{\n"
" FILE *f = tmpfile();\n"
" if (!f)\n"
" return;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Resource leak: f\n", errout.str());
check("void f()\n"
"{\n"
" FILE *f = tmpfile();\n"
" fclose(f);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" FILE *f = tmpfile();\n"
" if (!f)\n"
" return;\n"
" fclose(f);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("FILE *f()\n"
"{\n"
" return tmpfile();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void fcloseall_function()
{
check("void f()\n"
"{\n"
" FILE *f = fopen(fname, str);\n"
" fcloseall();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f()\n"
"{\n"
" FILE *f = tmpfile();\n"
" fcloseall();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void open_function()
{
check("void f(const char *path)\n"
"{\n"
" int fd = open(path, O_RDONLY);\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:4]: (error) Resource leak: fd\n", errout.str());
check("void f(const char *path)\n"
"{\n"
" int fd = open(path, O_RDONLY);\n"
" if (fd == -1)\n"
" return;\n"
" close(fd);\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f(const char *path)\n"
"{\n"
" int fd = open(path, O_RDONLY);\n"
" if (fd < 0)\n"
" return;\n"
" close(fd);\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
check("void f(const char *path)\n"
"{\n"
" int fd = open(path, O_RDONLY);\n"
" if (-1 == fd)\n"
" return;\n"
" close(fd);\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void creat_function()
{
check("void f(const char *path)\n"
"{\n"
" int fd = creat(path, S_IRWXU);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Resource leak: fd\n", errout.str());
}
void close_function()
{
check("void f(const char *path)\n"
"{\n"
" int fd = open(path, O_RDONLY);\n"
" close(fd);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(const char *path)\n"
"{\n"
" int fd = creat(path, S_IRWXU);\n"
" close(fd);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(const char *path)\n"
"{\n"
" int fd = creat(path, S_IRWXU);\n"
" if (close(fd) < 0) {\n"
" perror(\"close\");\n"
" }\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void fd_functions()
{
check("void f(const char *path)\n"
"{\n"
" int fd = open(path, O_RDONLY);\n"
" read(fd, buf, count);\n"
" readv(fd, iov, iovcnt);\n"
" readahead(fd, offset, count);\n"
" pread(fd, buf, count, offset);\n"
" write(fd, buf, count);\n"
" writev(fd, iov, iovcnt);\n"
" pwrite(fd, buf, count, offset);\n"
" ioctl(fd, request);\n"
" posix_fallocate(fd, offset, len);\n"
" posix_fadvise(fd, offset, len, advise);\n"
" fsync(fd);\n"
" fdatasync(fd);\n"
" sync_file_range(fd, offset, nbytes, flags);\n"
" lseek(fd, offset, whence);\n"
" fcntl(fd, cmd);\n"
" flock(fd, op);\n"
" lockf(fd, cmd, len);\n"
" ftruncate(fd, len);\n"
" fstat(fd, buf);\n"
" fchmod(fd, mode);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:24]: (error) Resource leak: fd\n", errout.str());
}
void opendir_function()
{
check("void f()\n"
"{\n"
" DIR *f = opendir(\".\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Resource leak: f\n", errout.str());
}
void fdopendir_function()
{
check("void f(int fd)\n"
"{\n"
" DIR *f = fdopendir(fd);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:4]: (error) Resource leak: f\n", errout.str());
}
void closedir_function()
{
check("void f()\n"
"{\n"
" DIR *f = opendir(\".\");\n"
" closedir(f);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void f(int fd)\n"
"{\n"
" DIR *f = fdopendir(fd);\n"
" closedir(f);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("void foo()\n"
"{\n"
" DIR * f = opendir(dirname);\n"
" if (closedir(f));\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void dir_functions()
{
check("void f()\n"
"{\n"
" DIR *f = opendir(dir);\n"
" readdir(f);\n;"
" readdir_r(f, entry, res);\n;"
" rewinddir(f);\n;"
" telldir(f);\n;"
" seekdir(f, 2)\n;"
" scandir(f, namelist, filter, comp);\n;"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Resource leak: f\n", errout.str());
}
void file_functions()
{
check("void f()\n"
"{\n"
"FILE *f = fopen(fname, str);\n"
"feof(f);\n"
"clearerr(in);\n"
"ferror(in);\n"
"fread(ptr, 10, 1, in);\n"
"fwrite(ptr, 10, 1, in);\n"
"fflush(in);\n"
"setbuf(in, buf);\n"
"setbuffer(in, buf, 100);\n"
"setlinebuf(in);\n"
"setvbuf(in, buf, _IOLBF, 0);\n"
"fseek(in, 10, SEEK_SET);\n"
"fseeko(in, 10, SEEK_SET);\n"
"ftell(in);\n"
"ftello(in);\n"
"rewind(in);\n"
"fsetpos(in, 0);\n"
"fgetpos(in, 10);\n"
"fprintf(in, \"text\\n\");\n"
"}\n");
ASSERT_EQUALS("[test.cpp:22]: (error) Resource leak: f\n", errout.str());
}
void getc_function()
{
{
check("void f()\n"
"{"
" int c;\n"
" FILE *fin1a = fopen (\"FILE.txt\", \"r\");\n"
" while ( (c = getc (fin1a)) != EOF)\n"
" { }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Resource leak: fin1a\n", errout.str());
}
{
check("void f()\n"
"{\n"
" int c;\n"
" FILE *fin1b = fopen(\"FILE.txt\", \"r\");\n"
" c = getc(fin1b);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:6]: (error) Resource leak: fin1b\n", errout.str());
}
}
void pointer_to_pointer()
{
check("void f(char **data)\n"
"{\n"
" char *c = new char[12];\n"
" *c = 0;\n"
" *data = c;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void dealloc_and_alloc_in_func()
{
check("char *f( const char *x )\n"
"{\n"
" delete [] x;\n"
" return new char[10];\n"
"}\n"
"\n"
"int main()\n"
"{\n"
" char *a=0;\n"
" a = f( a );\n"
" a[0] = 1;\n"
" delete [] a;\n"
" return 0;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void unknownSyntax1()
{
// I don't know what this syntax means so cppcheck should bail out
check("void foo()\n"
"{\n"
" void *sym = ( {\n"
" void *__ptr = malloc(100);\n"
" if(!__ptr && 100 != 0)\n"
" {\n"
" exit(1);\n"
" }\n"
" __ptr;\n"
" } );\n"
" free(sym);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void knownFunctions()
{
check("void foo()\n"
"{\n"
" int *p = new int[100];\n"
" typeid(p);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: p\n", errout.str());
}
void same_function_name()
{
check("void a(char *p)\n"
"{ }\n"
"void b()\n"
"{\n"
" char *p = malloc(10);\n"
" abc.a(p);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
static TestMemleakInFunction testMemleakInFunction;
class TestMemleakInClass : public TestFixture
{
public:
TestMemleakInClass() : TestFixture("TestMemleakInClass")
{ }
private:
void check(const char code[], bool showAll = false)
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.setVarId();
tokenizer.simplifyTokenList();
// Clear the error buffer..
errout.str("");
// Check for memory leaks..
Settings settings;
settings.inconclusive = true;
tokenizer.fillFunctionList();
CheckMemoryLeakInClass checkMemoryLeak(&tokenizer, &settings, this);
checkMemoryLeak.check();
}
void run()
{
TEST_CASE(class1);
TEST_CASE(class2);
TEST_CASE(class3);
TEST_CASE(class4);
TEST_CASE(class6);
TEST_CASE(class7);
TEST_CASE(class8);
TEST_CASE(class9);
TEST_CASE(class10);
TEST_CASE(class11);
TEST_CASE(class12);
TEST_CASE(class13);
TEST_CASE(class14);
TEST_CASE(class15);
TEST_CASE(staticvar);
TEST_CASE(use);
TEST_CASE(free_member_in_sub_func);
TEST_CASE(mismatch1);
}
void class1()
{
check("class Fred\n"
"{\n"
"private:\n"
" char *str1;\n"
" char *str2;\n"
"public:\n"
" Fred();\n"
" ~Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{\n"
" str1 = new char[10];\n"
" str2 = new char[10];\n"
"}\n"
"\n"
"Fred::~Fred()\n"
"{\n"
" delete [] str2;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:4]: (possible error) Memory leak: Fred::str1\n", errout.str());
}
void class2()
{
check("class Fred\n"
"{\n"
"private:\n"
" char *str1;\n"
"public:\n"
" Fred();\n"
" ~Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{\n"
" str1 = new char[10];\n"
"}\n"
"\n"
"Fred::~Fred()\n"
"{\n"
" free(str1);\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:17]: (possible error) Mismatching allocation and deallocation: Fred::str1\n", errout.str());
}
void class3()
{
check("class Token;\n"
"\n"
"class Tokenizer\n"
"{\n"
"private:\n"
" Token *_tokens;\n"
"\n"
"public:\n"
" Tokenizer();\n"
" ~Tokenizer();\n"
" void deleteTokens(Token *tok);\n"
"};\n"
"\n"
"Tokenizer::Tokenizer()\n"
"{\n"
" _tokens = new Token;\n"
"}\n"
"\n"
"Tokenizer::~Tokenizer()\n"
"{\n"
" deleteTokens(_tokens);\n"
"}\n"
"\n"
"void Tokenizer::deleteTokens(Token *tok)\n"
"{\n"
" while (tok)\n"
" {\n"
" Token *next = tok->next();\n"
" delete tok;\n"
" tok = next;\n"
" }\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void class4()
{
check("struct ABC;\n"
"class Fred\n"
"{\n"
"private:\n"
" void addAbc(ABC *abc);\n"
"public:\n"
" void click();\n"
"};\n"
"\n"
"void Fred::addAbc(ABC* abc)\n"
"{\n"
" AbcPosts->Add(abc);\n"
"}\n"
"\n"
"void Fred::click()\n"
"{\n"
" ABC *p = new ABC;\n"
" addAbc( p );\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void class6()
{
check("class Fred\n"
"{\n"
"public:\n"
" void foo();\n"
"};\n"
"\n"
"void Fred::foo()\n"
"{\n"
" char *str = new char[100];\n"
" delete [] str;\n"
" hello();\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void class7()
{
check("class Fred\n"
"{\n"
"public:\n"
" int *i;\n"
" Fred();\n"
" ~Fred();\n"
"};\n"
"\n"
"Fred::Fred()\n"
"{\n"
" this->i = new int;\n"
"}\n"
"Fred::~Fred()\n"
"{\n"
" delete this->i;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void class8()
{
check("class A\n"
"{\n"
"public:\n"
" void a();\n"
" void doNothing() { }\n"
"};\n"
"\n"
"void A::a()\n"
"{\n"
" int* c = new int(1);\n"
" delete c;\n"
" doNothing(c);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void class9()
{
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A();\n"
" ~A();\n"
"};\n"
"\n"
"A::A()\n"
"{ p = new int; }\n"
"\n"
"A::~A()\n"
"{ delete (p); }\n", true);
ASSERT_EQUALS("", errout.str());
}
void class10()
{
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A() { p = new int; }\n"
"};\n", true);
ASSERT_EQUALS("[test.cpp:4]: (possible error) Memory leak: A::p\n", errout.str());
}
void class11()
{
check("class A\n"
"{\n"
"public:\n"
" int * p;\n"
" A();\n"
"};\n"
"A::A() : p(new int[10])\n"
"{ }", true);
ASSERT_EQUALS("[test.cpp:4]: (possible error) Memory leak: A::p\n", errout.str());
}
void class12()
{
check("class A\n"
"{\n"
"private:\n"
" int *p;\n"
"public:\n"
" A();\n"
" ~A();\n"
" void cleanup();"
"};\n"
"\n"
"A::A()\n"
"{ p = new int[10]; }\n"
"\n"
"A::~A()\n"
"{ }\n"
"\n"
"void A::cleanup()\n"
"{ delete [] p; }\n", true);
ASSERT_EQUALS("[test.cpp:4]: (possible error) Memory leak: A::p\n", errout.str());
}
void class13()
{
check("class A\n"
"{\n"
"private:\n"
" int *p;\n"
"public:\n"
" A();\n"
" ~A();\n"
" void foo();"
"};\n"
"\n"
"A::A()\n"
"{ }\n"
"\n"
"A::~A()\n"
"{ }\n"
"\n"
"void A::foo()\n"
"{ p = new int[10]; delete [] p; }\n", true);
ASSERT_EQUALS("", errout.str());
}
void class14()
{
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" void init();\n"
"};\n"
"\n"
"void A::init()\n"
"{ p = new int[10]; }\n", true);
ASSERT_EQUALS("[test.cpp:3]: (possible error) Memory leak: A::p\n", errout.str());
}
void class15()
{
check("class A\n"
"{\n"
" int *p;\n"
"public:\n"
" A();\n"
" ~A() { delete [] p; }\n"
"};\n"
"A::A()\n"
"{ p = new int[10]; }", true);
ASSERT_EQUALS("", errout.str());
}
void staticvar()
{
check("class A\n"
"{\n"
"private:\n"
" static int * p;\n"
"public:"
" A()\n"
" {\n"
" if (!p)\n"
" p = new int[100];\n"
" }\n"
"};\n", true);
ASSERT_EQUALS("", errout.str());
}
void use()
{
check("class A\n"
"{\n"
"public:\n"
" Fred * fred;\n"
" A();\n"
"};\n"
"A::A()\n"
"{\n"
" fred = new Fred;\n"
" list->push_back(fred);\n"
"}", true);
TODO_ASSERT_EQUALS("", errout.str());
}
void free_member_in_sub_func()
{
// Member function
check("class Tokenizer\n"
"{\n"
"public:\n"
" Tokenizer();\n"
" ~Tokenizer();\n"
"\n"
"private:\n"
" int *_tokens;\n"
" static void deleteTokens(int *tok);\n"
"};\n"
"\n"
"Tokenizer::Tokenizer()\n"
"{\n"
" _tokens = new int;\n"
"}\n"
"\n"
"Tokenizer::~Tokenizer()\n"
"{\n"
" deleteTokens(_tokens);\n"
" _tokens = 0;\n"
"}\n"
"\n"
"void Tokenizer::deleteTokens(int *tok)\n"
"{\n"
" delete tok;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
// Global function
check("void deleteTokens(int *tok)\n"
"{\n"
" delete tok;\n"
"}\n"
"class Tokenizer\n"
"{\n"
"public:\n"
" Tokenizer();\n"
" ~Tokenizer();\n"
"\n"
"private:\n"
" int *_tokens;\n"
"};\n"
"\n"
"Tokenizer::Tokenizer()\n"
"{\n"
" _tokens = new int;\n"
"}\n"
"\n"
"Tokenizer::~Tokenizer()\n"
"{\n"
" deleteTokens(_tokens);\n"
" _tokens = 0;\n"
"}\n", true);
ASSERT_EQUALS("", errout.str());
}
void mismatch1()
{
check("class A\n"
"{\n"
"public:\n"
" A(int i);\n"
" ~A();\n"
"private:\n"
" char* pkt_buffer;\n"
"};\n"
"\n"
"A::A(int i)\n"
"{\n"
" pkt_buffer = new char[8192];\n"
" if (i != 1) {\n"
" delete pkt_buffer;\n"
" pkt_buffer = 0;\n"
" }\n"
"}\n"
"\n"
"A::~A() {\n"
" delete [] pkt_buffer;\n"
"}\n", true);
ASSERT_EQUALS("[test.cpp:14]: (possible error) Mismatching allocation and deallocation: A::pkt_buffer\n", errout.str());
}
};
static TestMemleakInClass testMemleakInClass;
class TestMemleakStructMember : public TestFixture
{
public:
TestMemleakStructMember() : TestFixture("TestMemleakStructMember")
{ }
private:
void check(const char code[])
{
// Tokenize..
Tokenizer tokenizer;
std::istringstream istr(code);
tokenizer.tokenize(istr, "test.cpp");
tokenizer.simplifyTokenList();
// Clear the error buffer..
errout.str("");
// Check for memory leaks..
Settings settings;
CheckMemoryLeakStructMember checkMemoryLeakStructMember(&tokenizer, &settings, this);
checkMemoryLeakStructMember.check();
}
void run()
{
// testing that errors are detected
TEST_CASE(err);
// handle / bail out when "goto" is found
TEST_CASE(goto_);
// Don't report errors if the struct is returned
TEST_CASE(ret);
// assignments
TEST_CASE(assign);
// Failed allocation
TEST_CASE(failedAllocation);
// Deallocating in a function
TEST_CASE(function);
// Handle if-else
TEST_CASE(ifelse);
// struct variable is a global variable
TEST_CASE(globalvar);
}
void err()
{
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" free(abc);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: abc.a\n", errout.str());
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
"}\n");
ASSERT_EQUALS("[test.cpp:5]: (error) Memory leak: abc.a\n", errout.str());
check("static ABC * foo()\n"
"{\n"
" ABC *abc = malloc(sizeof(ABC));\n"
" abc->a = malloc(10);\n"
" abc->b = malloc(10);\n"
" if (abc->b == 0)\n"
" {\n"
" return 0;\n"
" }\n"
" return abc;\n"
"}\n");
ASSERT_EQUALS("[test.cpp:8]: (error) Memory leak: abc.a\n", errout.str());
check("static void foo(int a)\n"
"{\n"
" ABC *abc = malloc(sizeof(ABC));\n"
" abc->a = malloc(10);\n"
" if (a == 1)\n"
" {\n"
" free(abc->a);\n"
" return;\n"
" }\n"
"}\n");
ASSERT_EQUALS("[test.cpp:10]: (error) Memory leak: abc.a\n", errout.str());
}
void goto_()
{
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" if (abc->a)\n"
" { goto out; }\n"
" free(abc);\n"
" return;\n"
"out:\n"
" free(abc->a);\n"
" free(abc);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ret()
{
check("static ABC * foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" return abc;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("static void foo(struct ABC *abc)\n"
"{\n"
" abc->a = malloc(10);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void assign()
{
check("static void foo()\n"
"{\n"
" struct ABC *abc = abc1;\n"
" abc->a = malloc(10);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("static void foo()\n"
"{\n"
" struct ABC *abc;\n"
" abc1 = abc = malloc(sizeof(ABC));\n"
" abc->a = malloc(10);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("static void foo()\n"
"{\n"
" struct msn_entry *ptr;\n"
" ptr = malloc(sizeof(struct msn_entry));\n"
" ptr->msn = malloc(100);\n"
" back = ptr;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void failedAllocation()
{
check("static struct ABC * foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" if (!abc->a)\n"
" {\n"
" free(abc);\n"
" return 0;\n"
" }\n"
" return abc;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void function()
{
// Not found function => assume that the function may deallocate
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" func(abc);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" abclist.push_back(abc);\n"
" abc->a = malloc(10);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void ifelse()
{
check("static void foo()\n"
"{\n"
" struct ABC *abc = malloc(sizeof(struct ABC));\n"
" if (x)"
" {\n"
" abc->a = malloc(10);\n"
" }\n"
" else\n"
" {\n"
" free(abc);\n"
" return;\n"
" }\n"
" free(abc->a);\n"
" free(abc);\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
void globalvar()
{
check("struct ABC *abc;\n"
"\n"
"static void foo()\n"
"{\n"
" abc = malloc(sizeof(struct ABC));\n"
" abc->a = malloc(10);\n"
" return;\n"
"}\n");
ASSERT_EQUALS("", errout.str());
}
};
static TestMemleakStructMember testMemleakStructMember;
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