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Refactorization/Partial rewrite of CheckClass::copyconstructors(): 

- Reformatted check code and some test cases
- Fixed false positives #4148 (non-copyable/unknown base classes) and #4178 (copy ctor implementation not seen)
- Proper usage of STL containers
- Better support for initializer list
- Rephrased error messages
This commit is contained in:
PKEuS 2012-09-10 13:31:30 +02:00
parent fa0414250d
commit 4e59e55229
3 changed files with 200 additions and 160 deletions
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137
lib/checkclass.cpp
View File

@ -157,125 +157,92 @@ void CheckClass::copyconstructors()
{
if (!_settings->isEnabled("style"))
return;
std::vector<unsigned int> var_id;
std::vector<std::string> var_name;
std::list<Scope>::const_iterator scope;
std::list<Function>::const_iterator func;
unsigned int flag=0,varid=0;
for (scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope) {
if (!scope->isClassOrStruct()) /*scope is class or structure*/
for (std::list<Scope>::const_iterator scope = symbolDatabase->scopeList.begin(); scope != symbolDatabase->scopeList.end(); ++scope) {
if (!scope->isClassOrStruct()) // scope is class or structure
continue;
int count_no_variables=0,count_copy_constructor=0,count_no_allocated_variables=0,count_no_of_pointer_variable=0;
std::list<Variable>::const_iterator var;
for (var = scope->varlist.begin(); var != scope->varlist.end(); ++var) {
if (var->isPointer()) {
count_no_of_pointer_variable ++;
}
}
if (count_no_of_pointer_variable>0) {
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
std::map<unsigned int, const Token*> allocatedVars;
for (std::list<Function>::const_iterator func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
if (func->type == Function::eConstructor && func->functionScope) {
for (const Token* tok = func->functionScope->classStart; tok!=func->functionScope->classEnd; tok=tok->next()) {
const char pattern[] = "%var% = new|malloc|g_malloc|g_try_malloc|realloc|g_realloc|g_try_realloc";
if (Token::Match(tok, pattern)) {
std::vector<std::string>::iterator it=var_name.begin();
std::vector<unsigned int>::iterator itr;
for (itr=var_id.begin(); itr!=var_id.end(); ++itr,++it) {
if (*itr==tok->varId()) {
break;
}
}
if (itr==var_id.end()) {
var_id.push_back(tok->varId());
var_name.push_back(tok->str());
count_no_allocated_variables++;
if (Token::Match(tok, "%var% = new|malloc|g_malloc|g_try_malloc|realloc|g_realloc|g_try_realloc")) {
const Variable* var = symbolDatabase->getVariableFromVarId(tok->varId());
if (var && var->isPointer() && var->scope() == &*scope)
allocatedVars[tok->varId()] = tok;
}
}
}
}
}
}
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
std::set<const Token*> copiedVars;
const Token* copyCtor = 0;
for (std::list<Function>::const_iterator func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
if (func->type == Function::eCopyConstructor) {
count_copy_constructor++;
break;
}
}
if (!var_id.empty() && count_copy_constructor==0) {
noCopyConstructorError(scope->classDef, scope->className, scope->classDef->str() == "struct");
}
if (count_copy_constructor==1) {
for (func = scope->functionList.begin(); func != scope->functionList.end(); ++func) {
if (func->type == Function::eCopyConstructor && func->functionScope) {
copyCtor = func->tokenDef;
if (func->functionScope) {
const Token* tok = func->tokenDef->linkAt(1)->next();
if (tok->str()==":") {
tok=tok->next();
if (Token::Match(tok,"%var% ( %var% . %var% )")) {
for (std::vector<unsigned int>::iterator itr=var_id.begin(); itr!=var_id.end(); ++itr) {
if (*itr==tok->varId()) {
flag=1;
varid=tok->varId();
while (Token::Match(tok, "%var% (")) {
if (allocatedVars.find(tok->varId()) != allocatedVars.end()) {
if (tok->varId() && Token::Match(tok->tokAt(2), "%var% . %var% )"))
copiedVars.insert(tok);
else if (!Token::Match(tok->tokAt(2), "%any% )"))
allocatedVars.erase(tok->varId()); // Assume memory is allocated
}
tok = tok->linkAt(1)->tokAt(2);
}
}
}
for (tok=func->functionScope->classStart; tok!=func->functionScope->classEnd; tok=tok->next()) {
const char pattern[] = "%var% = new|malloc|g_malloc|g_try_malloc|realloc|g_realloc|g_try_realloc";
if (Token::Match(tok, pattern)) {
std::vector<std::string>::iterator it=var_name.begin();
for (std::vector<unsigned int>::iterator itr=var_id.begin(); itr!=var_id.end(); ++itr,++it) {
if (*itr==tok->varId()) {
if (varid==tok->varId()) {
flag=0;
if (Token::Match(tok, "%var% = new|malloc|g_malloc|g_try_malloc|realloc|g_realloc|g_try_realloc")) {
allocatedVars.erase(tok->varId());
} else if (Token::Match(tok, "%var% = %var% . %var% ;") && allocatedVars.find(tok->varId()) != allocatedVars.end()) {
copiedVars.insert(tok);
}
count_no_variables++;
var_id.erase(itr);
var_name.erase(it);
}
} else // non-copyable or implementation not seen
allocatedVars.clear();
break;
}
}
if (!copyCtor) {
if (!allocatedVars.empty() && scope->derivedFrom.empty()) // TODO: Check if base class is non-copyable
noCopyConstructorError(scope->classDef, scope->className, scope->type == Scope::eStruct);
} else {
if (!copiedVars.empty()) {
for (std::set<const Token*>::const_iterator i = copiedVars.begin(); i != copiedVars.end(); ++i) {
copyConstructorShallowCopyError(*i, (*i)->str());
}
}
// throw error if count mismatch
for (std::map<unsigned int, const Token*>::const_iterator i = allocatedVars.begin(); i != allocatedVars.end(); ++i) {
copyConstructorMallocError(copyCtor, i->second, i->second->str());
}
}
if (flag==1) {
copyConstructorShallowCopyError(scope->classDef, scope->className, scope->classDef->str() == "struct");
}
/*if count mismatch throw error*/
if (count_no_variables!=count_no_allocated_variables) {
copyConstructorMallocError(scope->classDef, scope->className, scope->classDef->str() == "struct",var_name);
}
}
var_id.clear();
var_name.clear();
}
}
void CheckClass::copyConstructorMallocError(const Token *tok, const std::string &classname, bool isStruct, const std::vector<std::string>& var_name)
void CheckClass::copyConstructorMallocError(const Token *cctor, const Token *alloc, const std::string& varname)
{
for (std::vector<std::string>::const_iterator itr=var_name.begin(); itr!=var_name.end(); ++itr) {
reportError(tok, Severity::style, "copyConstructorNoAllocation", "The copy constructor of " + std::string(isStruct ? "struct" : "class") + " '" + classname +"' does not allocate memory for class member " + *itr+".");
}
std::list<const Token*> callstack;
callstack.push_back(cctor);
callstack.push_back(alloc);
reportError(callstack, Severity::warning, "copyCtorNoAllocation", "Copy constructor does not allocate memory for member '" + varname + "' although memory has been allocated in other constructors.");
}
void CheckClass::copyConstructorShallowCopyError(const Token *tok, const std::string &classname, bool isStruct)
void CheckClass::copyConstructorShallowCopyError(const Token *tok, const std::string& varname)
{
// For performance reasons the constructor might be intentionally missing. Therefore this is not a "warning"
reportError(tok, Severity::style, "copyConstructorPointerCopying", "The copy constructor of " + std::string(isStruct ? "struct" : "class") + " '" + classname +"' does not allocate memory for pointer class member and copying pointer values.");
reportError(tok, Severity::style, "copyCtorPointerCopying", "Value of pointer '" + varname + "', which points to allocated memory, is copied in copy constructor instead of allocating new memory.");
}
void CheckClass::noCopyConstructorError(const Token *tok, const std::string &classname, bool isStruct)
{
// For performance reasons the constructor might be intentionally missing. Therefore this is not a "warning"
// The constructor might be intentionally missing. Therefore this is not a "warning"
reportError(tok, Severity::style, "noCopyConstructor",
"The " + std::string(isStruct ? "struct" : "class") + " '" + classname +
"' does not have a copy constructor which is required since the class contains a pointer member.");
"'" + std::string(isStruct ? "struct" : "class") + " " + classname +
"' does not have a copy constructor which is required since the class contains a pointer to allocated memory.");
}
bool CheckClass::canNotCopy(const Scope *scope)
@ -1299,7 +1266,7 @@ void CheckClass::thisSubtractionError(const Token *tok)
void CheckClass::checkConst()
{
// This is an inconclusive check. False positives: #2340, #3322.
// This is an inconclusive check. False positives: #3322.
if (!_settings->inconclusive)
return;

9
lib/checkclass.h
View File

@ -117,8 +117,8 @@ private:
// Reporting errors..
void noConstructorError(const Token *tok, const std::string &classname, bool isStruct);
void copyConstructorMallocError(const Token *tok, const std::string &classname, bool isStruct, const std::vector<std::string>& var_name);
void copyConstructorShallowCopyError(const Token *tok, const std::string &classname, bool isStruct);
void copyConstructorMallocError(const Token *cctor, const Token *alloc, const std::string& var_name);
void copyConstructorShallowCopyError(const Token *tok, const std::string& varname);
void noCopyConstructorError(const Token *tok, const std::string &classname, bool isStruct);
void uninitVarError(const Token *tok, const std::string &classname, const std::string &varname);
void operatorEqVarError(const Token *tok, const std::string &classname, const std::string &varname);
@ -137,9 +137,8 @@ private:
void getErrorMessages(ErrorLogger *errorLogger, const Settings *settings) const {
CheckClass c(0, settings, errorLogger);
c.noConstructorError(0, "classname", false);
std::vector<std::string> temp;
c.copyConstructorMallocError(0, "class", false, temp);
c.copyConstructorShallowCopyError(0, "class", false);
c.copyConstructorMallocError(0, 0, "var");
c.copyConstructorShallowCopyError(0, "var");
c.noCopyConstructorError(0, "class", false);
c.uninitVarError(0, "classname", "varname");
c.operatorEqVarError(0, "classname", "");

104
test/testclass.cpp
View File

@ -185,7 +185,7 @@ private:
"{\n"
" public:\n"
" char *c,*p,*d;\n"
" F(const F &f) :p(f.p)\n"
" F(const F &f) : p(f.p), c(f.c)\n"
" {\n"
" p=(char *)malloc(strlen(f.p)+1);\n"
" strcpy(p,f.p);\n"
@ -196,7 +196,19 @@ private:
" strcpy(p,str);\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
ASSERT_EQUALS("[test.cpp:5]: (style) Value of pointer 'p', which points to allocated memory, is copied in copy constructor instead of allocating new memory.\n", errout.str());
checkCopyConstructor("class F {\n"
" char *p;\n"
" F(const F &f) {\n"
" p = f.p;\n"
" }\n"
" F(char *str) {\n"
" p = malloc(strlen(str)+1);\n"
" }\n"
"};");
ASSERT_EQUALS("[test.cpp:4]: (style) Value of pointer 'p', which points to allocated memory, is copied in copy constructor instead of allocating new memory.\n"
"[test.cpp:3] -> [test.cpp:7]: (warning) Copy constructor does not allocate memory for member 'p' although memory has been allocated in other constructors.\n", errout.str());
checkCopyConstructor("class F\n"
"{\n"
@ -211,7 +223,8 @@ private:
" strcpy(p,str);\n"
" }\n"
"};");
ASSERT_EQUALS("[test.cpp:1]: (style) The copy constructor of class 'F' does not allocate memory for pointer class member and copying pointer values.\n[test.cpp:1]: (style) The copy constructor of class 'F' does not allocate memory for class member p.\n", errout.str());
ASSERT_EQUALS("[test.cpp:5]: (style) Value of pointer 'p', which points to allocated memory, is copied in copy constructor instead of allocating new memory.\n"
"[test.cpp:5] -> [test.cpp:10]: (warning) Copy constructor does not allocate memory for member 'p' although memory has been allocated in other constructors.\n", errout.str());
checkCopyConstructor("class kalci\n"
"{\n"
@ -234,7 +247,7 @@ private:
" strcpy(p,f.p);\n"
" d=(char *)malloc(strlen(str)+1);\n"
" strcpy(p,f.p);\n"
"}\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
@ -242,24 +255,48 @@ private:
"{\n"
" public:\n"
" char *c,*p,*d;\n"
"F(char *str,char *st,char *string)\n"
"{\n"
" F(char *str,char *st,char *string)\n"
" {\n"
" p=(char *)malloc(100);\n"
" strcpy(p,str);\n"
" c=(char *)malloc(100);\n"
" strcpy(p,st);\n"
" d=(char *)malloc(100);\n"
" strcpy(p,string);\n"
"}\n"
"F(const F &f)\n"
"{\n"
" }\n"
" F(const F &f)\n"
" {\n"
" p=(char *)malloc(strlen(str)+1);\n"
" strcpy(p,f.p);\n"
" c=(char *)malloc(strlen(str)+1);\n"
" strcpy(p,f.p);\n"
"}\n"
" }\n"
"};");
ASSERT_EQUALS("[test.cpp:1]: (style) The copy constructor of class 'F' does not allocate memory for class member d.\n", errout.str());
ASSERT_EQUALS("[test.cpp:14] -> [test.cpp:11]: (warning) Copy constructor does not allocate memory for member 'd' although memory has been allocated in other constructors.\n", errout.str());
checkCopyConstructor("class F {\n"
" char *c;\n"
" F(char *str,char *st,char *string) {\n"
" p=(char *)malloc(100);\n"
" }\n"
" F(const F &f)\n"
" : p(malloc(size))\n"
" {\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
checkCopyConstructor("class F {\n"
" char *c;\n"
" F(char *str,char *st,char *string)\n"
" : p(malloc(size))\n"
" {\n"
" }\n"
" F(const F &f)\n"
" {\n"
" }\n"
"};");
TODO_ASSERT_EQUALS("[test.cpp:7] -> [test.cpp:4]: (warning) Copy constructor does not allocate memory for member 'd' although memory has been allocated in other constructors.\n", "", errout.str());
checkCopyConstructor("class F\n"
"{\n"
@ -272,7 +309,7 @@ private:
" d=(char*)malloc(100);\n"
" }\n"
"};");
ASSERT_EQUALS("[test.cpp:1]: (style) The class 'F' does not have a copy constructor which is required since the class contains a pointer member.\n", errout.str());
ASSERT_EQUALS("[test.cpp:1]: (style) 'class F' does not have a copy constructor which is required since the class contains a pointer to allocated memory.\n", errout.str());
checkCopyConstructor("class F\n"
"{\n"
@ -286,13 +323,50 @@ private:
" c=(char *)malloc(strlen(string)+1);\n"
" strcpy(d,string);\n"
" }\n"
"F(const F &f)\n"
"{\n"
" F(const F &f)\n"
" {\n"
" p=f.p;\n"
" d=f.d;\n"
" c=(char *)malloc(strlen(str)+1);\n"
" strcpy(d,f.p);\n"
"}\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
checkCopyConstructor("class F : E\n"
"{\n"
" char *p;\n"
" F() {\n"
" p = malloc(100);\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
checkCopyConstructor("class E { E(E&); };\n" // non-copyable
"class F : E\n"
"{\n"
" char *p;\n"
" F() {\n"
" p = malloc(100);\n"
" }\n"
"};");
ASSERT_EQUALS("", errout.str());
checkCopyConstructor("class E {};\n"
"class F : E {\n"
" char *p;\n"
" F() {\n"
" p = malloc(100);\n"
" }\n"
"};");
TODO_ASSERT_EQUALS("[test.cpp:2]: (style) 'class F' does not have a copy constructor which is required since the class contains a pointer to allocated memory.\n", "", errout.str());
checkCopyConstructor("class F {\n"
" char *p;\n"
" F() {\n"
" p = malloc(100);\n"
" }\n"
" F(F& f);\n" // non-copyable
"};");
ASSERT_EQUALS("", errout.str());
}