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Added auto_ptr checking for malloc

This commit is contained in:
Jakub Melka 2015-03-19 06:41:54 +01:00 committed by Daniel Marjamäki
parent e5e7c5dc8b
commit a49efb13f6
3 changed files with 83 additions and 0 deletions
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35
lib/checkstl.cpp
View File

@ -1232,7 +1232,9 @@ static bool hasArrayEndParen(const Token *tok1)
void CheckStl::checkAutoPointer()
{
std::set<unsigned int> autoPtrVarId;
std::map<unsigned int, const std::string> mallocVarId; // variables allocated by the malloc-like function
static const char STL_CONTAINER_LIST[] = "array|bitset|deque|list|forward_list|map|multimap|multiset|priority_queue|queue|set|stack|vector|hash_map|hash_multimap|hash_set|unordered_map|unordered_multimap|unordered_set|unordered_multiset|basic_string";
const int malloc = _settings->library.alloc("malloc"); // allocation function, which are not compatible with auto_ptr
for (const Token *tok = _tokenizer->tokens(); tok; tok = tok->next()) {
if (Token::simpleMatch(tok, "auto_ptr <")) {
@ -1247,6 +1249,17 @@ void CheckStl::checkAutoPointer()
if (Token::Match(tok3, "( new %type%") && hasArrayEndParen(tok3)) {
autoPointerArrayError(tok2->next());
}
if (Token::Match(tok3, "( %name% (") && malloc && _settings->library.alloc(tok3->next()) == malloc) {
// malloc-like function allocated memory passed to the auto_ptr constructor -> error
autoPointerMallocError(tok2->next(), tok3->next()->str());
}
if (Token::Match(tok3, "( %var%")) {
std::map<unsigned int, const std::string>::const_iterator it = mallocVarId.find(tok3->next()->varId());
if (it != mallocVarId.cend()) {
// pointer on the memory allocated by malloc used in the auto pointer constructor -> error
autoPointerMallocError(tok2->next(), it->second);
}
}
while (tok3 && tok3->str() != ";") {
tok3 = tok3->next();
}
@ -1280,6 +1293,21 @@ void CheckStl::checkAutoPointer()
if (iter != autoPtrVarId.end()) {
autoPointerArrayError(tok);
}
} else if (Token::Match(tok, "%var% = %name% (") && malloc && _settings->library.alloc(tok->tokAt(2)) == malloc) {
// C library function like 'malloc' used together with auto pointer -> error
std::set<unsigned int>::const_iterator iter = autoPtrVarId.find(tok->varId());
if (iter != autoPtrVarId.end()) {
autoPointerMallocError(tok, tok->strAt(2));
} else if (tok->varId()) {
// it is not an auto pointer variable and it is allocated by malloc like function.
mallocVarId.insert(std::make_pair(tok->varId(), tok->strAt(2)));
}
} else if (Token::Match(tok, "%var% . reset ( %name% (") && malloc && _settings->library.alloc(tok->tokAt(4)) == malloc) {
// C library function like 'malloc' used when resetting auto pointer -> error
std::set<unsigned int>::const_iterator iter = autoPtrVarId.find(tok->varId());
if (iter != autoPtrVarId.end()) {
autoPointerMallocError(tok, tok->strAt(4));
}
}
}
}
@ -1310,6 +1338,13 @@ void CheckStl::autoPointerArrayError(const Token *tok)
);
}
void CheckStl::autoPointerMallocError(const Token *tok, const std::string& allocFunction)
{
const std::string summary = "Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with function '" + allocFunction + "'.";
const std::string verbose = summary + " This means that you should only use 'auto_ptr' for pointers obtained with operator 'new'. This excludes use C library allocation functions (for example '" + allocFunction + "'), which must be deallocated by the appropriate C library function.";
reportError(tok, Severity::error, "useAutoPointerMalloc", summary + "\n" + verbose);
}
void CheckStl::uselessCalls()
{
// THIS ARRAY MUST BE ORDERED ALPHABETICALLY

2
lib/checkstl.h
View File

@ -178,6 +178,7 @@ private:
void autoPointerError(const Token *tok);
void autoPointerContainerError(const Token *tok);
void autoPointerArrayError(const Token *tok);
void autoPointerMallocError(const Token *tok, const std::string& allocFunction);
void uselessCallsReturnValueError(const Token *tok, const std::string &varname, const std::string &function);
void uselessCallsSwapError(const Token *tok, const std::string &varname);
@ -210,6 +211,7 @@ private:
c.autoPointerError(0);
c.autoPointerContainerError(0);
c.autoPointerArrayError(0);
c.autoPointerMallocError(0, "malloc");
c.uselessCallsReturnValueError(0, "str", "find");
c.uselessCallsSwapError(0, "str");
c.uselessCallsSubstrError(0, false);

46
test/teststl.cpp
View File

@ -2298,6 +2298,52 @@ private:
" auto_ptr_array<char> domainName(new char[42]);\n"
"}");
ASSERT_EQUALS("", errout.str());
// ticket #749
check("int main()\n"
"{\n"
" int *i = malloc(sizeof(int));\n"
" auto_ptr<int> x(i);\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with function 'malloc'.\n", errout.str());
check("int main()\n"
"{\n"
" auto_ptr<int> x((int*)malloc(sizeof(int)*4));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with function 'malloc'.\n", errout.str());
check("int main()\n"
"{\n"
" auto_ptr<int> b(static_cast<int*>(malloc(sizeof(int)*4)));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with function 'malloc'.\n", errout.str());
check("int main()\n"
"{\n"
" auto_ptr<int> x = (int*)malloc(sizeof(int)*4);\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with function 'malloc'.\n", errout.str());
check("int main()\n"
"{\n"
" auto_ptr<int> x = static_cast<int*>(malloc(sizeof(int)*4));\n"
"}");
ASSERT_EQUALS("[test.cpp:3]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with function 'malloc'.\n", errout.str());
check("int main()\n"
"{\n"
" auto_ptr<int> x;\n"
" x.reset((int*)malloc(sizeof(int)*4));\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with function 'malloc'.\n", errout.str());
check("int main()\n"
"{\n"
" auto_ptr<int> x;\n"
" x.reset(static_cast<int*>(malloc(sizeof(int)*4)));\n"
"}");
ASSERT_EQUALS("[test.cpp:4]: (error) Object pointed by an 'auto_ptr' is destroyed using operator 'delete'. You should not use 'auto_ptr' for pointers obtained with function 'malloc'.\n", errout.str());
}
void uselessCalls() {