//---------------------------------------------------------------------------
// Usage of function variables
//---------------------------------------------------------------------------
void CheckUnusedVar::checkFunctionVariableUsage_iterateScopes(const Scope* const scope, Variables& variables, bool insideLoop)
{
Variables::ScopeGuard scopeGuard=variables.newScope(insideLoop);
// Find declarations if the scope is executable..
if (scope->isExecutable()) {
// Find declarations
for (std::list<Variable>::const_iterator i = scope->varlist.begin(); i != scope->varlist.end(); ++i) {
if (i->isThrow() || i->isExtern())
continue;
Variables::VariableType type = Variables::none;
if (i->isArray() && (i->nameToken()->previous()->str() == "*" || i->nameToken()->strAt(-2) == "*"))
type = Variables::pointerArray;
else if (i->isArray() && i->nameToken()->previous()->str() == "&")
type = Variables::referenceArray;
else if (i->isArray())
type = Variables::array;
else if (i->isReference())
type = Variables::reference;
else if (i->nameToken()->previous()->str() == "*" && i->nameToken()->strAt(-2) == "*")
type = Variables::pointerPointer;
else if (i->isPointer())
type = Variables::pointer;
else if (_tokenizer->isC() ||
i->typeEndToken()->isStandardType() ||
isRecordTypeWithoutSideEffects(i->type()) ||
(i->isStlType() &&
!Token::Match(i->typeStartToken()->tokAt(2), "lock_guard|unique_lock|shared_ptr|unique_ptr|auto_ptr|shared_lock")))
type = Variables::standard;
if (type == Variables::none || isPartOfClassStructUnion(i->typeStartToken()))
continue;
const Token* defValTok = i->nameToken()->next();
for (; defValTok; defValTok = defValTok->next()) {
if (defValTok->str() == "[")
defValTok = defValTok->link();
else if (defValTok->str() == "(" || defValTok->str() == "{" || defValTok->str() == "=") {
variables.addVar(&*i, type, true);
break;
} else if (defValTok->str() == ";" || defValTok->str() == "," || defValTok->str() == ")") {
variables.addVar(&*i, type, i->isStatic());
break;
}
}
if (i->isArray() && i->isClass()) // Array of class/struct members. Initialized by ctor.
variables.write(i->declarationId(), i->nameToken());
if (i->isArray() && Token::Match(i->nameToken(), "%name% [ %var% ]")) // Array index variable read.
variables.read(i->nameToken()->tokAt(2)->varId(), i->nameToken());
if (defValTok && defValTok->str() == "=") {
if (defValTok->next() && defValTok->next()->str() == "{") {
for (const Token* tok = defValTok; tok && tok != defValTok->linkAt(1); tok = tok->next())
if (tok->varId()) // Variables used to initialize the array read.
variables.read(tok->varId(), i->nameToken());
} else
doAssignment(variables, i->nameToken(), false, scope);
}
}
}
// Check variable usage
const Token *tok;
if (scope->type == Scope::eFunction)
tok = scope->classStart->next();
else
tok = scope->classDef->next();
for (; tok && tok != scope->classEnd; tok = tok->next()) {
if (tok->str() == "for" || tok->str() == "while" || tok->str() == "do") {
for (std::list<Scope*>::const_iterator i = scope->nestedList.begin(); i != scope->nestedList.end(); ++i) {
if ((*i)->classDef == tok) { // Find associated scope
checkFunctionVariableUsage_iterateScopes(*i, variables, true); // Scan child scope
tok = (*i)->classStart->link();
break;
}
}
if (!tok)
break;
}
if (tok->str() == "{" && tok != scope->classStart && !tok->previous()->varId()) {
for (std::list<Scope*>::const_iterator i = scope->nestedList.begin(); i != scope->nestedList.end(); ++i) {
if ((*i)->classStart == tok) { // Find associated scope
checkFunctionVariableUsage_iterateScopes(*i, variables, false); // Scan child scope
tok = tok->link();
break;
}
}
if (!tok)
break;
}
if (Token::Match(tok, "asm ( %str% )")) {
variables.clear();
break;
}
if (Token::simpleMatch(tok, "goto")) { // https://sourceforge.net/apps/trac/cppcheck/ticket/4447
variables.clear();
break;
}
// bailout when for_each is used
if (Token::Match(tok, "%name% (") && Token::simpleMatch(tok->linkAt(1), ") {") && !Token::Match(tok, "if|for|while|switch")) {
// does the name contain "for_each" or "foreach"?
std::string nameTok;
nameTok.resize(tok->str().size());
std::transform(tok->str().begin(), tok->str().end(), nameTok.begin(), ::tolower);
if (nameTok.find("foreach") != std::string::npos || nameTok.find("for_each") != std::string::npos) {
// bailout all variables in the body that are used more than once.
// TODO: there is no need to bailout if variable is only read or only written
std::set<unsigned int> varid;
const Token * const endTok = tok->linkAt(1)->linkAt(1);
for (const Token *tok2 = endTok->link(); tok2 && tok2 != endTok; tok2 = tok2->next()) {
if (tok2->varId()) {
if (varid.find(tok2->varId()) == varid.end())
varid.insert(tok2->varId());
else
variables.erase(tok2->varId());
}
}
}
}
// C++11 std::for_each
// No warning should be written if a variable is first read and
// then written in the body.
else if (Token::simpleMatch(tok, "for_each (") && Token::simpleMatch(tok->linkAt(1), ") ;")) {
const Token *end = tok->linkAt(1);
if (end->previous()->str() == "}") {
std::set<unsigned int> readvar;
for (const Token *body = end->linkAt(-1); body != end; body = body->next()) {
if (body->varId() == 0U)
continue;
if (!Token::simpleMatch(body->next(),"="))
readvar.insert(body->varId());
else if (readvar.find(body->varId()) != readvar.end())
variables.erase(body->varId());
}
}
}
else if (Token::Match(tok->previous(), "[;{}]")) {
for (const Token* tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if (tok2->varId()) {
const Variable *var = tok2->variable();
if (var && var->nameToken() == tok2) { // Declaration: Skip
tok = tok2->next();
if (Token::Match(tok, "( %name% )")) // Simple initialization through copy ctor
tok = tok->next();
else if (Token::Match(tok, "= %var% ;")) { // Simple initialization
tok = tok->next();
if (!var->isReference())
variables.read(tok->varId(), tok);
} else if (var->typeEndToken()->str() == ">") // Be careful with types like std::vector
tok = tok->previous();
break;
}
} else if (Token::Match(tok2, "[;({=]"))
break;
}
}
// Freeing memory (not considered "using" the pointer if it was also allocated in this function)
if (Token::Match(tok, "free|g_free|kfree|vfree ( %var% )") ||
Token::Match(tok, "delete %var% ;") ||
Token::Match(tok, "delete [ ] %var% ;")) {
unsigned int varid = 0;
if (tok->str() != "delete") {
varid = tok->tokAt(2)->varId();
tok = tok->tokAt(3);
} else if (tok->strAt(1) == "[") {
varid = tok->tokAt(3)->varId();
tok = tok->tokAt(3);
} else {
varid = tok->next()->varId();
tok = tok->next();
}
Variables::VariableUsage *var = variables.find(varid);
if (var && !var->_allocateMemory) {
variables.readAll(varid, tok);
}
}
else if (Token::Match(tok, "return|throw")) {
for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if (tok2->varId())
variables.readAll(tok2->varId(), tok);
else if (tok2->str() == ";")
break;
}
}
else if (Token::Match(tok->tokAt(-2), "while|if") && tok->strAt(1) == "=" && tok->varId() && tok->varId() == tok->tokAt(2)->varId()) {
variables.use(tok->tokAt(2)->varId(), tok);
}
// assignment
else if (Token::Match(tok, "*| ++|--| %name% ++|--| =") ||
Token::Match(tok, "*| ( const| %type% *| ) %name% =")) {
bool dereference = false;
bool pre = false;
bool post = false;
if (tok->str() == "*") {
dereference = true;
tok = tok->next();
}
if (Token::Match(tok, "( const| %type% *| ) %name% ="))
tok = tok->link()->next();
else if (tok->str() == "(")
tok = tok->next();
if (tok->type() == Token::eIncDecOp) {
pre = true;
tok = tok->next();
}
if (tok->next()->type() == Token::eIncDecOp)
post = true;
const unsigned int varid1 = tok->varId();
const Token * const start = tok;
tok = doAssignment(variables, tok, dereference, scope);
if (pre || post)
variables.use(varid1, tok);
if (dereference) {
Variables::VariableUsage *var = variables.find(varid1);
if (var && var->_type == Variables::array)
variables.write(varid1, tok);
variables.writeAliases(varid1, tok);
variables.read(varid1, tok);
} else {
Variables::VariableUsage *var = variables.find(varid1);
if (var && start->strAt(-1) == ",") {
variables.use(varid1, tok);
} else if (var && var->_type == Variables::reference) {
variables.writeAliases(varid1, tok);
variables.read(varid1, tok);
}
// Consider allocating memory separately because allocating/freeing alone does not constitute using the variable
else if (var && var->_type == Variables::pointer &&
Token::Match(start, "%name% = new|malloc|calloc|kmalloc|kzalloc|kcalloc|strdup|strndup|vmalloc|g_new0|g_try_new|g_new|g_malloc|g_malloc0|g_try_malloc|g_try_malloc0|g_strdup|g_strndup|g_strdup_printf")) {
bool allocate = true;
if (start->strAt(2) == "new") {
const Token *type = start->tokAt(3);
// skip nothrow
if (Token::simpleMatch(type, "( nothrow )") ||
Token::simpleMatch(type, "( std :: nothrow )"))
type = type->link()->next();
// is it a user defined type?
if (!type->isStandardType()) {
const Variable *variable = start->variable();
if (!variable || !isRecordTypeWithoutSideEffects(variable->type()))
allocate = false;
}
}
if (allocate)
variables.allocateMemory(varid1, tok);
else
variables.write(varid1, tok);
} else if (varid1 && Token::Match(tok, "%varid% .", varid1)) {
variables.use(varid1, tok);
} else {
variables.write(varid1, tok);
}
Variables::VariableUsage *var2 = variables.find(tok->varId());
if (var2) {
if (var2->_type == Variables::reference) {
variables.writeAliases(tok->varId(), tok);
variables.read(tok->varId(), tok);
} else if (tok->varId() != varid1 && Token::Match(tok, "%name% ."))
variables.read(tok->varId(), tok);
else if (tok->varId() != varid1 &&
var2->_type == Variables::standard &&
tok->strAt(-1) != "&")
variables.use(tok->varId(), tok);
}
}
const Token * const equal = skipBracketsAndMembers(tok->next());
// checked for chained assignments
if (tok != start && equal && equal->str() == "=") {
unsigned int varId = tok->varId();
Variables::VariableUsage *var = variables.find(varId);
if (var && var->_type != Variables::reference) {
variables.read(varId,tok);
}
tok = tok->previous();
}
}
// assignment
else if ((Token::Match(tok, "%name% [") && Token::simpleMatch(skipBracketsAndMembers(tok->next()), "=")) ||
(Token::simpleMatch(tok, "* (") && Token::simpleMatch(tok->next()->link(), ") ="))) {
if (tok->str() == "*") {
tok = tok->tokAt(2);
if (tok->str() == "(")
tok = tok->link()->next();
}
unsigned int varid = tok->varId();
const Variables::VariableUsage *var = variables.find(varid);
if (var) {
// Consider allocating memory separately because allocating/freeing alone does not constitute using the variable
if (var->_type == Variables::pointer &&
Token::Match(skipBrackets(tok->next()), "= new|malloc|calloc|kmalloc|kzalloc|kcalloc|strdup|strndup|vmalloc|g_new0|g_try_new|g_new|g_malloc|g_malloc0|g_try_malloc|g_try_malloc0|g_strdup|g_strndup|g_strdup_printf")) {
variables.allocateMemory(varid, tok);
} else if (var->_type == Variables::pointer || var->_type == Variables::reference) {
variables.read(varid, tok);
variables.writeAliases(varid, tok);
} else if (var->_type == Variables::pointerArray) {
tok = doAssignment(variables, tok, false, scope);
} else
variables.writeAll(varid, tok);
}
}
else if (_tokenizer->isCPP() && Token::Match(tok, "[;{}] %var% <<")) {
variables.erase(tok->next()->varId());
}
else if (Token::Match(tok, "& %var%")) {
if (tok->astOperand2()) { // bitop
variables.read(tok->next()->varId(), tok);
} else // addressof
variables.use(tok->next()->varId(), tok); // use = read + write
} else if (Token::Match(tok, ">>|>>= %name%")) {
if (_tokenizer->isC() || (tok->previous()->variable() && tok->previous()->variable()->typeEndToken()->isStandardType() && tok->astOperand1() && tok->astOperand1()->str() != ">>"))
variables.read(tok->next()->varId(), tok);
else
variables.use(tok->next()->varId(), tok); // use = read + write
} else if (Token::Match(tok, "%var% >>|&") && Token::Match(tok->previous(), "[{};:]")) {
variables.read(tok->varId(), tok);
}
// function parameter
else if (Token::Match(tok, "[(,] %var% [")) {
variables.use(tok->next()->varId(), tok); // use = read + write
} else if (Token::Match(tok, "[(,] %var% [,)]") && tok->previous()->str() != "*") {
variables.use(tok->next()->varId(), tok); // use = read + write
} else if (Token::Match(tok, "[(,] (") &&
Token::Match(tok->next()->link(), ") %var% [,)]")) {
variables.use(tok->next()->link()->next()->varId(), tok); // use = read + write
}
// function
else if (Token::Match(tok, "%var% (")) {
variables.read(tok->varId(), tok);
}
else if (Token::Match(tok->previous(), "[{,] %var% [,}]")) {
variables.read(tok->varId(), tok);
}
else if (tok->varId() && Token::Match(tok, "%var% .")) {
variables.use(tok->varId(), tok); // use = read + write
}
else if (tok->isExtendedOp() && tok->next() && tok->next()->varId() && tok->strAt(2) != "=") {
variables.readAll(tok->next()->varId(), tok);
}
else if (tok->varId() && tok->next() && (tok->next()->str() == ")" || tok->next()->isExtendedOp())) {
variables.readAll(tok->varId(), tok);
}
else if (Token::Match(tok, "%var% ;") && Token::Match(tok->previous(), "[;{}:]")) {
variables.readAll(tok->varId(), tok);
}
// ++|--
else if (tok->next() && tok->next()->type() == Token::eIncDecOp && tok->next()->astOperand1() && tok->next()->astOperand1()->varId()) {
if (tok->next()->astParent())
variables.use(tok->next()->astOperand1()->varId(), tok);
else
variables.modified(tok->next()->astOperand1()->varId(), tok);
}
else if (tok->isAssignmentOp()) {
for (const Token *tok2 = tok->next(); tok2 && tok2->str() != ";"; tok2 = tok2->next()) {
if (tok2->varId()) {
if (tok2->strAt(1) == "=")
variables.write(tok2->varId(), tok);
else if (tok2->next()->isAssignmentOp())
variables.use(tok2->varId(), tok);
else
variables.read(tok2->varId(), tok);
}
}
}
}
}
//---------------------------------------------------------------------------
// Usage of function variables
//---------------------------------------------------------------------------
void CheckUnusedVar::checkFunctionVariableUsage_iterateScopes(const Scope* const scope, Variables& variables)
{
if (scope->type == Scope::eClass || scope->type == Scope::eUnion || scope->type == Scope::eStruct)
return;
// Find declarations
for (std::list<Variable>::const_iterator i = scope->varlist.begin(); i != scope->varlist.end(); ++i) {
Variables::VariableType type = Variables::none;
if (i->isArray() && (i->nameToken()->previous()->str() == "*" || i->nameToken()->strAt(-2) == "*"))
type = Variables::pointerArray;
else if (i->isArray() && i->nameToken()->previous()->str() == "&")
type = Variables::referenceArray;
else if (i->isArray())
type = Variables::array;
else if (i->nameToken()->previous()->str() == "&")
type = Variables::reference;
else if (i->nameToken()->previous()->str() == "*" && i->nameToken()->strAt(-2) == "*")
type = Variables::pointerPointer;
else if (i->nameToken()->previous()->str() == "*" || Token::Match(i->nameToken()->tokAt(-2), "* %type%"))
type = Variables::pointer;
else if (i->typeEndToken()->isStandardType() || isRecordTypeWithoutSideEffects(*i) || Token::simpleMatch(i->nameToken()->tokAt(-3), "std :: string"))
type = Variables::standard;
if (type == Variables::none || isPartOfClassStructUnion(i->typeStartToken()))
continue;
const Token* defValTok = i->nameToken()->next();
for (; defValTok; defValTok = defValTok->next()) {
if (defValTok->str() == "[")
defValTok = defValTok->link();
else if (defValTok->str() == "(" || defValTok->str() == "=") {
variables.addVar(i->nameToken(), type, scope, true);
break;
} else if (defValTok->str() == ";" || defValTok->str() == "," || defValTok->str() == ")") {
variables.addVar(i->nameToken(), type, scope, i->isStatic());
break;
}
}
if (i->isArray() && Token::Match(i->nameToken(), "%var% [ %var% ]")) // Array index variable read.
variables.read(i->nameToken()->tokAt(2)->varId());
if (defValTok && defValTok->str() == "=") {
if (defValTok->next() && defValTok->next()->str() == "{") {
for (const Token* tok = defValTok; tok && tok != defValTok->linkAt(1); tok = tok->next())
if (Token::Match(tok, "%var%")) // Variables used to initialize the array read.
variables.read(tok->varId());
} else
doAssignment(variables, i->nameToken(), false, scope);
} else if (Token::Match(defValTok, "( %var% )")) // Variables used to initialize the variable read.
variables.readAll(defValTok->next()->varId()); // ReadAll?
}
// Check variable usage
for (const Token *tok = scope->classDef->next(); tok && tok != scope->classEnd; tok = tok->next()) {
if (tok->str() == "for" || tok->str() == "catch") {
for (std::list<Scope*>::const_iterator i = scope->nestedList.begin(); i != scope->nestedList.end(); ++i) {
if ((*i)->classDef == tok) { // Find associated scope
checkFunctionVariableUsage_iterateScopes(*i, variables); // Scan child scope
tok = (*i)->classStart->link();
break;
}
}
if (!tok)
break;
}
if (tok->str() == "{") {
for (std::list<Scope*>::const_iterator i = scope->nestedList.begin(); i != scope->nestedList.end(); ++i) {
if ((*i)->classStart == tok) { // Find associated scope
checkFunctionVariableUsage_iterateScopes(*i, variables); // Scan child scope
tok = tok->link();
break;
}
}
if (!tok)
break;
}
if (Token::Match(tok, "asm ( %str% )")) {
variables.clear();
break;
}
if (Token::Match(tok, "%type% const| *|&| const| *| const| %var% [;=[(]") && tok->str() != "return" && tok->str() != "throw") { // Declaration: Skip
tok = tok->next();
while (Token::Match(tok, "const|*|&"))
tok = tok->next();
tok = Token::findmatch(tok, "[;=[(]");
if (tok && Token::Match(tok, "( %var% )")) // Simple initialization through copy ctor
tok = tok->next();
else if (tok && Token::Match(tok, "= %var% ;")) // Simple initialization
tok = tok->next();
if (!tok)
break;
}
// Freeing memory (not considered "using" the pointer if it was also allocated in this function)
if (Token::Match(tok, "free|g_free|kfree|vfree ( %var% )") ||
Token::Match(tok, "delete %var% ;") ||
Token::Match(tok, "delete [ ] %var% ;")) {
unsigned int varid = 0;
if (tok->str() != "delete") {
varid = tok->tokAt(2)->varId();
tok = tok->tokAt(3);
} else if (tok->strAt(1) == "[") {
varid = tok->tokAt(3)->varId();
tok = tok->tokAt(3);
} else {
varid = tok->next()->varId();
tok = tok->next();
}
Variables::VariableUsage *var = variables.find(varid);
if (var && !var->_allocateMemory) {
variables.readAll(varid);
}
}
else if (Token::Match(tok, "return|throw %var%")) {
for (const Token *tok2 = tok->next(); tok2; tok2 = tok2->next()) {
if (tok2->varId())
variables.readAll(tok2->varId());
else if (tok2->str() == ";")
break;
}
}
// assignment
else if (!Token::Match(tok->tokAt(-2), "[;{}.] %var% (") &&
(Token::Match(tok, "*| (| ++|--| %var% ++|--| )| =") ||
Token::Match(tok, "*| ( const| %type% *| ) %var% ="))) {
bool dereference = false;
bool pre = false;
bool post = false;
if (tok->str() == "*") {
dereference = true;
tok = tok->next();
}
if (Token::Match(tok, "( const| %type% *| ) %var% ="))
tok = tok->link()->next();
else if (tok->str() == "(")
tok = tok->next();
if (Token::Match(tok, "++|--")) {
pre = true;
tok = tok->next();
}
if (Token::Match(tok->next(), "++|--"))
post = true;
const unsigned int varid1 = tok->varId();
const Token *start = tok;
tok = tok->tokAt(doAssignment(variables, tok, dereference, scope));
if (pre || post)
variables.use(varid1);
if (dereference) {
Variables::VariableUsage *var = variables.find(varid1);
if (var && var->_type == Variables::array)
variables.write(varid1);
variables.writeAliases(varid1);
variables.read(varid1);
} else {
Variables::VariableUsage *var = variables.find(varid1);
if (var && var->_type == Variables::reference) {
variables.writeAliases(varid1);
variables.read(varid1);
}
// Consider allocating memory separately because allocating/freeing alone does not constitute using the variable
else if (var && var->_type == Variables::pointer &&
Token::Match(start, "%var% = new|malloc|calloc|g_malloc|kmalloc|vmalloc")) {
bool allocate = true;
if (start->strAt(2) == "new") {
const Token *type = start->tokAt(3);
// skip nothrow
if (Token::simpleMatch(type, "( nothrow )") ||
Token::simpleMatch(type, "( std :: nothrow )"))
type = type->link()->next();
// is it a user defined type?
if (!type->isStandardType()) {
const Variable* variable = _tokenizer->getSymbolDatabase()->getVariableFromVarId(start->varId());
if (!variable || !isRecordTypeWithoutSideEffects(*variable))
allocate = false;
}
}
if (allocate)
variables.allocateMemory(varid1);
else
variables.write(varid1);
} else if (varid1 && Token::Match(tok, "%varid% .", varid1)) {
variables.use(varid1);
} else {
variables.write(varid1);
}
Variables::VariableUsage *var2 = variables.find(tok->varId());
if (var2) {
if (var2->_type == Variables::reference) {
variables.writeAliases(tok->varId());
variables.read(tok->varId());
} else if (tok->varId() != varid1 && Token::Match(tok, "%var% ."))
variables.read(tok->varId());
else if (tok->varId() != varid1 &&
var2->_type == Variables::standard &&
tok->strAt(-1) != "&")
variables.use(tok->varId());
}
}
const Token *equal = skipBrackets(tok->next());
// checked for chained assignments
if (tok != start && equal && equal->str() == "=") {
Variables::VariableUsage *var = variables.find(tok->varId());
if (var && var->_type != Variables::reference)
var->_read = true;
tok = tok->previous();
}
}
// assignment
else if (Token::Match(tok, "%var% [") && Token::simpleMatch(skipBrackets(tok->next()), "=")) {
unsigned int varid = tok->varId();
const Variables::VariableUsage *var = variables.find(varid);
if (var) {
// Consider allocating memory separately because allocating/freeing alone does not constitute using the variable
if (var->_type == Variables::pointer &&
Token::Match(skipBrackets(tok->next()), "= new|malloc|calloc|g_malloc|kmalloc|vmalloc")) {
variables.allocateMemory(varid);
} else if (var->_type == Variables::pointer || var->_type == Variables::reference) {
variables.read(varid);
variables.writeAliases(varid);
} else
variables.writeAll(varid);
}
}
else if (Token::Match(tok, ">>|& %var%"))
variables.use(tok->next()->varId()); // use = read + write
else if (Token::Match(tok, "%var% >>|&") && Token::Match(tok->previous(), "[{};:]"))
variables.read(tok->varId());
// function parameter
else if (Token::Match(tok, "[(,] %var% ["))
variables.use(tok->next()->varId()); // use = read + write
else if (Token::Match(tok, "[(,] %var% [,)]") && tok->previous()->str() != "*") {
variables.use(tok->next()->varId()); // use = read + write
} else if (Token::Match(tok, "[(,] (") &&
Token::Match(tok->next()->link(), ") %var% [,)]"))
variables.use(tok->next()->link()->next()->varId()); // use = read + write
// function
else if (Token::Match(tok, "%var% (")) {
variables.read(tok->varId());
if (Token::Match(tok->tokAt(2), "%var% ="))
variables.read(tok->tokAt(2)->varId());
}
else if (Token::Match(tok, "[{,] %var% [,}]"))
variables.read(tok->next()->varId());
else if (Token::Match(tok, "%var% ."))
variables.use(tok->varId()); // use = read + write
else if ((Token::Match(tok, "[(=&!]") || tok->isExtendedOp()) &&
(Token::Match(tok->next(), "%var%") && !Token::Match(tok->next(), "true|false|new")) && tok->strAt(2) != "=")
variables.readAll(tok->next()->varId());
else if (Token::Match(tok, "%var%") && (tok->next()->str() == ")" || tok->next()->isExtendedOp()))
variables.readAll(tok->varId());
else if (Token::Match(tok, "%var% ;") && Token::Match(tok->previous(), "[;{}:]"))
variables.readAll(tok->varId());
else if (Token::Match(tok, "++|-- %var%")) {
if (!Token::Match(tok->previous(), "[;{}:]"))
variables.use(tok->next()->varId());
else
variables.modified(tok->next()->varId());
}
else if (Token::Match(tok, "%var% ++|--")) {
if (!Token::Match(tok->previous(), "[;{}:]"))
variables.use(tok->varId());
else
variables.modified(tok->varId());
}
else if (tok->isAssignmentOp()) {
for (const Token *tok2 = tok->next(); tok2 && tok2->str() != ";"; tok2 = tok2->next()) {
if (tok2->varId()) {
variables.read(tok2->varId());
if (tok2->next()->isAssignmentOp())
variables.write(tok2->varId());
}
}
}
}
}
