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CheckClass: Improvements and refactorings for constructors and variables checking

This commit is contained in:
Robert Reif 2010-07-14 19:00:52 +02:00 committed by Daniel Marjamäki
parent a6b6022497
commit fd352865ca
4 changed files with 279 additions and 141 deletions
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383
lib/checkclass.cpp
View File

@ -333,7 +333,7 @@ void CheckClass::initializeVarList(const Token *tok1, const Token *ftok, Var *va
}
// Calling member function?
else if (Token::Match(ftok, "%var% ("))
else if (Token::Match(ftok, "%var% (") && ftok->str() != "if")
{
// Passing "this" => assume that everything is initialized
for (const Token * tok2 = ftok->next()->link(); tok2 && tok2 != ftok; tok2 = tok2->previous())
@ -346,9 +346,6 @@ void CheckClass::initializeVarList(const Token *tok1, const Token *ftok, Var *va
}
}
if (ftok->str() == "if")
continue;
// recursive call / calling overloaded function
// assume that all variables are initialized
if (std::find(callstack.begin(), callstack.end(), ftok->str()) != callstack.end())
@ -369,7 +366,7 @@ void CheckClass::initializeVarList(const Token *tok1, const Token *ftok, Var *va
else // there is a called member function, but it is not defined where we can find it, so we assume it initializes everything
{
// check if the function is part of this class..
const Token *tok = Token::findmatch(_tokenizer->tokens(), (std::string("class ") + classname + " {").c_str());
const Token *tok = Token::findmatch(_tokenizer->tokens(), ((isStruct ? std::string("struct ") : std::string("class ")) + classname + " {").c_str());
for (tok = tok ? tok->tokAt(3) : 0; tok; tok = tok->next())
{
if (tok->str() == "{")
@ -457,15 +454,76 @@ void CheckClass::initializeVarList(const Token *tok1, const Token *ftok, Var *va
}
}
//---------------------------------------------------------------------------
// ClassCheck: Check that all class constructors are ok.
//---------------------------------------------------------------------------
struct Constructor
{
enum AccessControl { Public, Protected, Private };
Constructor(const Token * tok, AccessControl acc, bool body, bool equal, bool copy) :
token(tok), access(acc), hasBody(body), isOperatorEqual(equal), isCopyConstructor(copy)
{
}
const Token *token;
AccessControl access;
bool hasBody;
bool isOperatorEqual;
bool isCopyConstructor;
};
static bool argsMatch(const Token *first, const Token *second)
{
bool match = false;
while (first->str() == second->str())
{
// at end of argument list
if (first->str() == ")")
{
match = true;
break;
}
// skip default value assignment
else if (first->next()->str() == "=")
{
first = first->tokAt(2);
continue;
}
// definition missing variable name
else if (first->next()->str() == "," && second->next()->str() != ",")
second = second->next();
else if (first->next()->str() == ")" && second->next()->str() != ")")
second = second->next();
// argument list has different number of arguments
else if (second->str() == ")")
break;
// variable names are different
else if ((Token::Match(first->next(), "%var% ,|)|=") &&
Token::Match(second->next(), "%var% ,|)")) &&
(first->next()->str() != second->next()->str()))
{
// skip variable names
first = first->next();
second = second->next();
// skip default value assignment
if (first->next()->str() == "=")
first = first->tokAt(2);
}
first = first->next();
second = second->next();
}
return match;
}
void CheckClass::constructors()
{
if (!_settings->_checkCodingStyle)
@ -475,81 +533,165 @@ void CheckClass::constructors()
// Locate class
const Token *tok1 = Token::findmatch(_tokenizer->tokens(), pattern_class);
while (tok1)
for (; tok1; tok1 = Token::findmatch(tok1->next(), pattern_class))
{
const std::string className = tok1->strAt(1);
const Token *classNameToken = tok1->tokAt(1);
bool isStruct = tok1->str() == "struct";
/** @todo handling of private constructors should be improved */
bool hasPrivateConstructor = false;
const Token *end = tok1;
while (end->str() != "{")
end = end->next();
end = end->link();
int indentlevel = 0;
Constructor::AccessControl access = isStruct ? Constructor::Public : Constructor::Private;
std::list<Constructor> constructorList;
unsigned int numConstructors = 0;
// check to end of class definition
for (const Token *tok = tok1; tok; tok = tok->next())
{
int indentlevel = 0;
bool isPrivate = !isStruct;
for (const Token *tok = tok1; tok; tok = tok->next())
// Indentation
if (tok->str() == "{")
++indentlevel;
else if (tok->str() == "}")
{
// Indentation
if (tok->str() == "{")
++indentlevel;
--indentlevel;
if (indentlevel <= 0)
break;
}
else if (tok->str() == "}")
// Parse class contents (indentlevel == 1)..
if (indentlevel == 1)
{
// What section are we in..
if (tok->str() == "private:")
access = Constructor::Private;
else if (tok->str() == "protected:")
access = Constructor::Protected;
else if (tok->str() == "public:")
access = Constructor::Public;
// Is there a constructor?
else if (Token::simpleMatch(tok, (className + " (").c_str()) ||
Token::simpleMatch(tok, "operator = ("))
{
--indentlevel;
if (indentlevel <= 0)
break;
}
bool operatorEqual = tok->str() == "operator";
bool copyConstructor = Token::Match(tok, "%var% ( const %var% & %var%| )");
const Token *next = operatorEqual ? tok->tokAt(2)->link() : tok->next()->link();
// Parse class contents (indentlevel == 1)..
if (indentlevel == 1)
{
// What section are we in.. private/non-private
if (tok->str() == "private:")
isPrivate = true;
else if (tok->str() == "protected:" || tok->str() == "public:")
isPrivate = false;
if (!operatorEqual)
numConstructors++;
// Is there a private constructor?
else if (isPrivate && Token::simpleMatch(tok, (classNameToken->str() + " (").c_str()))
// out of line function
if (Token::Match(next, ") ;"))
{
hasPrivateConstructor = true;
std::string classPattern;
int offset;
if (operatorEqual)
{
classPattern = className + " :: operator = (";
offset = 5;
}
else
{
classPattern = className + " :: " + className + " (";
offset = 4;
}
bool hasBody = false;
// start looking at end of class
const Token *constructor_token = end;
while ((constructor_token = Token::findmatch(constructor_token, classPattern.c_str())) != NULL)
{
// skip destructor and other classes
if (!Token::Match(constructor_token->previous(), "~|::"))
{
if (argsMatch(tok->tokAt(offset - 2), constructor_token->tokAt(offset)))
{
if (operatorEqual || copyConstructor)
constructorList.push_back(Constructor(constructor_token, access, true, operatorEqual, copyConstructor));
else
constructorList.push_front(Constructor(constructor_token, access, true, false, false));
hasBody = true;
break;
}
}
// skip function body
while (constructor_token->str() != "{")
constructor_token = constructor_token->next();
constructor_token = constructor_token->link();
}
// function body found?
if (!hasBody)
{
if (operatorEqual || copyConstructor)
constructorList.push_back(Constructor(tok, access, false, operatorEqual, copyConstructor));
else
constructorList.push_front(Constructor(tok, access, false, false, false));
}
tok = next->next();
}
// inline function
else
{
// skip destructor and other classes
if (!Token::Match(tok->previous(), "~|::"))
{
if (operatorEqual || copyConstructor)
constructorList.push_back(Constructor(tok, access, true, operatorEqual, copyConstructor));
else
constructorList.push_front(Constructor(tok, access, true, false, false));
}
// skip over function body
tok = next->next();
while (tok->str() != "{")
tok = tok->next();
tok = tok->link();
}
}
}
}
// Get variables that are not classes...
Var *varlist = getVarList(tok1, false, isStruct);
// There are no constructors.
if (numConstructors == 0)
{
// If "--style" has been given, give a warning
if (_settings->_checkCodingStyle)
{
// If there is a private variable, there should be a constructor..
for (const Var *var = varlist; var; var = var->next)
{
if (var->priv && !var->isStatic)
{
noConstructorError(tok1, className, isStruct);
break;
}
}
}
}
if (hasPrivateConstructor && !_settings->inconclusive)
{
/** @todo Handle private constructors. Right now to avoid
* false positives we just bail out */
tok1 = Token::findmatch(tok1->next(), pattern_class);
continue;
}
std::list<Constructor>::const_iterator it;
bool hasClasses = false;
// Are there a class constructor?
std::string tempPattern = "%any% " + classNameToken->str() + " (";
const Token *constructor_token = Token::findmatch(tok1, tempPattern.c_str());
while (constructor_token && constructor_token->str() == "~")
constructor_token = Token::findmatch(constructor_token->next(), tempPattern.c_str());
// There are no constructor.
if (! constructor_token)
for (it = constructorList.begin(); it != constructorList.end(); ++it)
{
// If "--style" has been given, give a warning
if (_settings->_checkCodingStyle)
// check for end of regular constructors and start of copy constructors
bool needClasses = it->isCopyConstructor || it->isOperatorEqual;
if (needClasses != hasClasses)
{
// Get class variables...
Var *varlist = getVarList(tok1, false, isStruct);
// If there is a private variable, there should be a constructor..
for (const Var *var = varlist; var; var = var->next)
{
if (var->priv && !var->isStatic)
{
noConstructorError(tok1, classNameToken->str(), isStruct);
break;
}
}
hasClasses = needClasses;
// Delete the varlist..
while (varlist)
@ -558,87 +700,64 @@ void CheckClass::constructors()
delete varlist;
varlist = nextvar;
}
// Get variables including classes
varlist = getVarList(tok1, true, isStruct);
}
tok1 = Token::findmatch(tok1->next(), pattern_class);
continue;
}
// Check constructors
checkConstructors(tok1, className, hasPrivateConstructor, isStruct);
// Check assignment operators
checkConstructors(tok1, "operator =", hasPrivateConstructor, isStruct);
tok1 = Token::findmatch(tok1->next(), pattern_class);
}
}
void CheckClass::checkConstructors(const Token *tok1, const std::string &funcname, bool hasPrivateConstructor, bool isStruct)
{
const std::string className = tok1->strAt(1);
// Check that all member variables are initialized..
const bool withClasses = bool(_settings->inconclusive && funcname == "operator =");
Var *varlist = getVarList(tok1, withClasses, isStruct);
int indentlevel = 0;
const Token *constructor_token = _tokenizer->findClassFunction(tok1, className, funcname, indentlevel, isStruct);
std::list<std::string> callstack;
initializeVarList(tok1, constructor_token, varlist, className, callstack, isStruct);
while (constructor_token)
{
// Check if any variables are uninitialized
for (Var *var = varlist; var; var = var->next)
{
if (var->init || var->isStatic)
if (!it->hasBody)
continue;
// It's non-static and it's not initialized => error
if (Token::simpleMatch(constructor_token, "operator = (") ||
Token::simpleMatch(constructor_token->tokAt(2), "operator = ("))
std::list<std::string> callstack;
initializeVarList(tok1, it->token, varlist, className, callstack, isStruct);
// Check if any variables are uninitialized
for (Var *var = varlist; var; var = var->next)
{
const Token *operStart = 0;
if (Token::simpleMatch(constructor_token, "operator = ("))
operStart = constructor_token->tokAt(2);
else
operStart = constructor_token->tokAt(4);
if (var->init || var->isStatic)
continue;
bool classNameUsed = false;
for (const Token *operTok = operStart; operTok != operStart->link(); operTok = operTok->next())
// It's non-static and it's not initialized => error
if (it->isOperatorEqual)
{
if (operTok->str() == className)
{
classNameUsed = true;
break;
}
}
const Token *operStart = 0;
if (Token::simpleMatch(it->token, "operator = ("))
operStart = it->token->tokAt(2);
else
operStart = it->token->tokAt(4);
if (classNameUsed)
operatorEqVarError(constructor_token, className, var->name);
bool classNameUsed = false;
for (const Token *operTok = operStart; operTok != operStart->link(); operTok = operTok->next())
{
if (operTok->str() == className)
{
classNameUsed = true;
break;
}
}
if (classNameUsed)
operatorEqVarError(it->token, className, var->name);
}
else if (it->access != Constructor::Private && !var->isStatic)
uninitVarError(it->token, className, var->name);
}
else if (!hasPrivateConstructor && !var->isStatic)
uninitVarError(constructor_token, className, var->name);
// Mark all variables not used
for (Var *var = varlist; var; var = var->next)
var->init = false;
}
for (Var *var = varlist; var; var = var->next)
var->init = false;
constructor_token = _tokenizer->findClassFunction(constructor_token->next(), className, funcname, indentlevel, isStruct);
callstack.clear();
initializeVarList(tok1, constructor_token, varlist, className, callstack, isStruct);
}
// Delete the varlist..
while (varlist)
{
Var *nextvar = varlist->next;
delete varlist;
varlist = nextvar;
// Delete the varlist..
while (varlist)
{
Var *nextvar = varlist->next;
delete varlist;
varlist = nextvar;
}
}
}
//---------------------------------------------------------------------------
// ClassCheck: Unused private functions
//---------------------------------------------------------------------------

3
lib/checkclass.h
View File

@ -163,9 +163,6 @@ private:
*/
Var *getVarList(const Token *tok1, bool withClasses, bool isStruct);
// Check constructors for a specified class
void checkConstructors(const Token *tok1, const std::string &funcname, bool hasPrivateConstructor, bool isStruct);
bool sameFunc(int nest, const Token *firstEnd, const Token *secondEnd);
bool isMemberFunc(const Token *tok);
bool isMemberVar(const std::string &classname, const Var *varlist, const Token *tok);

8
test/testclass.cpp
View File

@ -1580,7 +1580,7 @@ private:
" }\n"
" return *this;\n"
"}\n");
TODO_ASSERT_EQUALS("[test.cpp:8]: (style) Member variable 'Foo::a' is not assigned a value in 'Foo::operator='\n", errout.str());
ASSERT_EQUALS("[test.cpp:8]: (style) Member variable 'Foo::a' is not assigned a value in 'Foo::operator='\n", errout.str());
}
void uninitVarArray1()
@ -1853,11 +1853,7 @@ private:
" Foo(int _i) { }\n"
"};\n");
// actual results
ASSERT_EQUALS("", errout.str());
// wanted results - warning for the public constructor
TODO_ASSERT_EQUALS("[test.cpp:7]: (style) Member variable not initialized in the constructor 'Foo::foo'\n", errout.str());
ASSERT_EQUALS("[test.cpp:7]: (style) Member variable not initialized in the constructor 'Foo::foo'\n", errout.str());
}

26
test/testconstructors.cpp
View File

@ -72,6 +72,7 @@ private:
TEST_CASE(initvar_staticvar);
TEST_CASE(initvar_private_constructor); // BUG 2354171 - private constructor
TEST_CASE(initvar_copy_constructor); // ticket #1611
TEST_CASE(initvar_destructor); // No variables need to be initialized in a destructor
@ -677,6 +678,31 @@ private:
ASSERT_EQUALS("", errout.str());
}
void initvar_copy_constructor() // ticket #1611
{
check("class Fred\n"
"{\n"
"private:\n"
" std::string var;\n"
"public:\n"
" Fred() { };\n"
" Fred(const Fred &) { };\n"
"};");
ASSERT_EQUALS("[test.cpp:7]: (style) Member variable not initialized in the constructor 'Fred::var'\n", errout.str());
check("class Fred\n"
"{\n"
"private:\n"
" std::string var;\n"
"public:\n"
" Fred();\n"
" Fred(const Fred &);\n"
"};\n"
"Fred::Fred() { };\n"
"Fred::Fred(const Fred &) { };\n");
ASSERT_EQUALS("[test.cpp:10]: (style) Member variable not initialized in the constructor 'Fred::var'\n", errout.str());
}
void initvar_destructor()
{
check("class Fred\n"