Fix issue 9756: false negative: invalid iterator from std::find_if (#2760)
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@ -84,7 +84,7 @@ public:
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checkStl.knownEmptyContainerLoop();
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checkStl.stlBoundaries();
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checkStl.checkDereferenceInvalidIterator();
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checkStl.checkDereferenceInvalidIterator();
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checkStl.checkDereferenceInvalidIterator2();
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checkStl.checkMutexes();
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@ -1703,6 +1703,14 @@ static void valueFlowGlobalStaticVar(TokenList *tokenList, const Settings *setti
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}
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}
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static void valueFlowForwardVariable(Token* const startToken,
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const Token* const endToken,
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const Variable* const var,
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std::list<ValueFlow::Value> values,
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TokenList* const tokenlist,
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const Settings* const settings);
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// Old deprecated version
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static void valueFlowForward(Token* startToken,
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const Token* endToken,
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const Token* exprTok,
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@ -2696,6 +2704,17 @@ static void valueFlowForwardVariable(Token* const startToken,
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}
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}
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static void valueFlowForwardVariable(Token* const startToken,
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const Token* const endToken,
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const Variable* const var,
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std::list<ValueFlow::Value> values,
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TokenList* const tokenlist,
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const Settings* const settings)
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{
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valueFlowForwardVariable(startToken, endToken, var, std::move(values), getAliasesFromValues(values), tokenlist, settings);
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}
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// Old deprecated version
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static bool valueFlowForwardVariable(Token* const startToken,
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const Token* const endToken,
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const Variable* const var,
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@ -2707,7 +2726,7 @@ static bool valueFlowForwardVariable(Token* const startToken,
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ErrorLogger* const,
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const Settings* const settings)
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{
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valueFlowForwardVariable(startToken, endToken, var, std::move(values), getAliasesFromValues(values), tokenlist, settings);
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valueFlowForwardVariable(startToken, endToken, var, std::move(values), tokenlist, settings);
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return true;
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}
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@ -2857,10 +2876,7 @@ static void valueFlowForward(Token* startToken,
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const Token* endToken,
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const Token* exprTok,
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std::list<ValueFlow::Value> values,
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const bool constValue,
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const bool subFunction,
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TokenList* const tokenlist,
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ErrorLogger* const errorLogger,
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const Settings* settings)
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{
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const Token* expr = solveExprValues(exprTok, values);
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@ -2868,18 +2884,28 @@ static void valueFlowForward(Token* startToken,
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valueFlowForwardVariable(startToken,
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endToken,
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expr->variable(),
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expr->varId(),
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values,
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constValue,
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subFunction,
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tokenlist,
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errorLogger,
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settings);
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} else {
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valueFlowForwardExpression(startToken, endToken, expr, values, tokenlist, settings);
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}
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}
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// Old deprecated version
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static void valueFlowForward(Token* startToken,
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const Token* endToken,
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const Token* exprTok,
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std::list<ValueFlow::Value> values,
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const bool,
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const bool,
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TokenList* const tokenlist,
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ErrorLogger* const,
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const Settings* settings)
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{
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valueFlowForward(startToken, endToken, exprTok, std::move(values), tokenlist, settings);
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}
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static int getArgumentPos(const Variable *var, const Function *f)
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{
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auto arg_it = std::find_if(f->argumentList.begin(), f->argumentList.end(), [&](const Variable &v) {
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@ -4441,8 +4467,8 @@ static void valueFlowAfterCondition(TokenList *tokenlist,
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const Token* stop,
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const Token* vartok,
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const std::list<ValueFlow::Value>& values,
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bool constValue) {
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valueFlowForward(start->next(), stop, vartok, values, constValue, false, tokenlist, errorLogger, settings);
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bool) {
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valueFlowForward(start->next(), stop, vartok, values, tokenlist, settings);
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std::vector<const Variable*> vars = getExprVariables(vartok, tokenlist, symboldatabase, settings);
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return isVariablesChanged(start, stop, 0, vars, settings, tokenlist->isCPP());
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};
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@ -5913,6 +5939,60 @@ static void valueFlowIterators(TokenList *tokenlist, const Settings *settings)
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}
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}
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static std::list<ValueFlow::Value> getIteratorValues(std::list<ValueFlow::Value> values)
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{
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values.remove_if([&](const ValueFlow::Value& v) {
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return !v.isIteratorEndValue() && !v.isIteratorStartValue();
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});
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return values;
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}
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static void valueFlowIteratorAfterCondition(TokenList *tokenlist,
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SymbolDatabase *symboldatabase,
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ErrorLogger *errorLogger,
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const Settings *settings)
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{
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ValueFlowConditionHandler handler;
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handler.forward = [&](Token* start,
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const Token* stop,
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const Token* vartok,
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const std::list<ValueFlow::Value>& values,
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bool) {
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valueFlowForward(start->next(), stop, vartok, values, tokenlist, settings);
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std::vector<const Variable*> vars = getExprVariables(vartok, tokenlist, symboldatabase, settings);
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return isVariablesChanged(start, stop, 0, vars, settings, tokenlist->isCPP());
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};
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handler.parse = [&](const Token *tok) {
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ValueFlowConditionHandler::Condition cond;
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ValueFlow::Value true_value;
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ValueFlow::Value false_value;
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if (Token::Match(tok, "==|!=")) {
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if (!tok->astOperand1() || !tok->astOperand2())
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return cond;
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std::list<ValueFlow::Value> values = getIteratorValues(tok->astOperand1()->values());
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if (!values.empty()) {
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cond.vartok = tok->astOperand2();
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} else {
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values = getIteratorValues(tok->astOperand2()->values());
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if (!values.empty())
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cond.vartok = tok->astOperand1();
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}
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for(ValueFlow::Value& v:values) {
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v.setPossible();
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v.assumeCondition(tok);
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}
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cond.true_values = values;
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cond.false_values = values;
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}
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return cond;
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};
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handler.afterCondition(tokenlist, symboldatabase, errorLogger, settings);
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}
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static void valueFlowContainerSize(TokenList *tokenlist, SymbolDatabase* symboldatabase, ErrorLogger * /*errorLogger*/, const Settings *settings)
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{
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// declaration
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@ -6411,6 +6491,12 @@ ValueFlow::Value::Value(const Token* c, long long val)
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errorPath.emplace_back(c, "Assuming that condition '" + c->expressionString() + "' is not redundant");
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}
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void ValueFlow::Value::assumeCondition(const Token* tok)
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{
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condition = tok;
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errorPath.emplace_back(tok, "Assuming that condition '" + tok->expressionString() + "' is not redundant");
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}
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std::string ValueFlow::Value::infoString() const
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{
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switch (valueType) {
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@ -6509,6 +6595,7 @@ void ValueFlow::setValues(TokenList *tokenlist, SymbolDatabase* symboldatabase,
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if (tokenlist->isCPP()) {
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valueFlowSmartPointer(tokenlist, errorLogger, settings);
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valueFlowIterators(tokenlist, settings);
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valueFlowIteratorAfterCondition(tokenlist, symboldatabase, errorLogger, settings);
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valueFlowContainerSize(tokenlist, symboldatabase, errorLogger, settings);
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valueFlowContainerAfterCondition(tokenlist, symboldatabase, errorLogger, settings);
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}
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@ -170,6 +170,8 @@ namespace ValueFlow {
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decreaseRange();
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}
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void assumeCondition(const Token* tok);
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std::string infoString() const;
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enum ValueType { INT, TOK, FLOAT, MOVED, UNINIT, CONTAINER_SIZE, LIFETIME, BUFFER_SIZE, ITERATOR_START, ITERATOR_END } valueType;
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@ -3619,6 +3619,27 @@ private:
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" return *(v.begin() + pos);\n"
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"}\n");
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ASSERT_EQUALS("", errout.str());
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check("int f(std::vector<int> v, int i) {\n"
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" auto it = std::find(v.begin(), v.end(), i);\n"
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" if (it != v.end()) {}\n"
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" return *it;\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:4]: (warning) Either the condition 'it!=v.end()' is redundant or there is possible dereference of an invalid iterator: it.\n", errout.str());
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check("void f(std::vector<int> & v) {\n"
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" std::vector<int>::iterator i= v.begin();\n"
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" if(i == v.end() && *(i+1) == *i) {}\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:3]: (warning) Either the condition 'i==v.end()' is redundant or there is possible dereference of an invalid iterator: i+1.\n"
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"[test.cpp:3] -> [test.cpp:3]: (warning) Either the condition 'i==v.end()' is redundant or there is possible dereference of an invalid iterator: i.\n", errout.str());
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check("void f(std::vector<int> & v) {\n"
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" std::vector<int>::iterator i= v.begin();\n"
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" if(i == v.end() && *i == *(i+1)) {}\n"
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"}\n");
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ASSERT_EQUALS("[test.cpp:3] -> [test.cpp:3]: (warning) Either the condition 'i==v.end()' is redundant or there is possible dereference of an invalid iterator: i.\n"
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"[test.cpp:3] -> [test.cpp:3]: (warning) Either the condition 'i==v.end()' is redundant or there is possible dereference of an invalid iterator: i+1.\n", errout.str());
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}
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void dereferenceInvalidIterator2() {
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