V1088. Unary minus operator does not modify a bool type value. It is highly probable that the semicolon ';' is missing after 'return' keyword. It is pointless to compute the distance between the elements of different arrays. Postfix increment/decrement is senseless because this variable is overwritten. The functions from time.h/ctime should not be used. Line splice results in a character sequence that matches the syntax of a universal-character-name. V1043. V1033. Such a pointer will become invalid. V3025. V593. The expression is incorrect or it can be simplified. This is the same thing that happens at the end of the function anyway. V1024. V2598. All integer constants of unsigned type should have 'u' or 'U' suffix. Perhaps, this statement should have been compared with something else. V514. Character escape is used in multicharacter literal. V3151. The 'if (A) {} else if (A) {}' pattern was detected. Please attach your files here. V3146. Use volatile variable(s) or synchronization primitives to avoid this. V685. Consider using a comparison with defined precision: fabs(A - B) < Epsilon or fabs(A - B) > Epsilon. V3162. V2533. An excessive type cast or check. Consider pre-allocating it by calling reserve(N). Call of function 'foo' with variable number of arguments. V2556. Non-void functions are required to have a return type. This leads to undefined behavior. One, the C standard specifies the behavior of, C error: non-void function does not return a value in all control paths [-Werror,-Wreturn-type], the assembly GCC 11.2 generates for this with, testing by changing the function return type to int and changing the returns to, How a top-ranked engineering school reimagined CS curriculum (Ep. An odd sequence of assignments of this kind: A = B; B = A; V3038. V126. Empty exception handler. The class implements a copy constructor/operator=, but lacks the operator=/copy constructor. The standard input/output functions should not be used. If no value is provided, the compiler will produce a syntax error. Email? The 'continue' operator will terminate 'do { } while (false)' loop because the condition is always false. A memory/resource leak is possible. The '\0xNN' characters were encountered. Check the following code block after the 'if' statement. Tag names should be unique across all name spaces. Unsafe invocation of event, NullReferenceException is possible. Void functions dont need a return statement. It is possible that another argument should be passed instead. MISRA. In a main function, the return statement and expression are optional. The reason for the error/warning message is because a void function, by definition, does not return a value. You may or may not use the return . V1047. V3175. Content Discovery initiative April 13 update: Related questions using a Review our technical responses for the 2023 Developer Survey, C, error: control reaches end of non-void function [-Werror,-Wreturn-type], Control may reach end of non-void function [-Werror,-Wreturn-type]. As the diagnostic message states, the function does have a control path where a value isn't returned. Try to avoid many return statements in your code. This leads to the variable binding to a temporary object instead of a range element. All integer constants of unsigned type should have 'U' suffix. V013. MISRA. V2523. OWASP. The '? This return value is also printed. You are assuming that loop will always run, but, what if an empty string ends up getting submitted? AUTOSAR. V6105. Function returns a pointer to the internal string buffer of a local object, which will be destroyed. operator should have 'bool' type. 2.3 Void functions (non-value returning functions) Argument is a non-constant reference. V2580. The object was created but it is not being used. This recommendation encompasses ERR33-C. Detect and handle standard library errors. Potential logical error. V012. There is nothing we can do in this situation - there are no default values to return in case of exceptions. Conditional expressions of 'if' statements located next to each other are identical. It means that there is no default return value for your function outside of the for loop. All conditional inclusion preprocessor directives should reside in the same file as the conditional inclusion directive to which they are related. V564. Variable is not used after memory is allocated for it. Sign in Possible XSS vulnerability. Probably the '-=' should be used here. Unreachable code detected. V6003. V2511. Analysis aborted by timeout. Function '<procedurename>' doesn't return a value on all code paths V792. The compiler isn't going to go to very much trouble to detect this situation, because functions like throw_blah which are guaranteed to never return are rare, and because except in the simplest of situations, there's no way for it to reliably do so. MISRA. Looking at the assembly GCC 11.2 generates for this with -O3, we see it has in fact recognized that the union of all cases in the if and else if covers all possibilities: It has generated only two code paths, not three. Calling the 'foo' virtual function in the constructor/destructor may lead to unexpected result at runtime. The 'SuspendThread' function is usually used when developing a debugger. Consider implementing event accessors explicitly or use 'sealed' keyword. C-style explicit type casting is utilized. Consider inspecting the expression. C compiling Error: non-void function does not return a value in all control paths - CS50. MISRA. V2610. Perhaps, it is a typo and 'X' variable should be used instead of 'Y'. The object was created but it is not being used. V3551. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, If you are never going to return something, why do you declare the function as doing so? The variable 'X' is being used for this loop and for the outer loop. AUTOSAR. The expression is always false on newer compilers. Void functions are created and used just like value-returning functions except they do not return a value after the function executes. V1046. AUTOSAR. Inline functions should be declared with the static storage class. Potentially tainted data is used in the URL. V556. Decreased performance. V6047. Here's the correct version: The 'main' and 'wmain' functions are the exceptions. V1069. By clicking Sign up for GitHub, you agree to our terms of service and Potentially negative value is used as the size of an array. V3506. B is never printed because the statement never executes. Possible overflow. V6077. Expression 'A = B == C' is calculated as 'A = (B == C)'. V695. V589. V1093. Documentation - Arm Developer Casting pointer to a type of a larger size is an implementation-defined behavior. MISRA. Dangerous explicit type pointer conversion. The 'foo' word is suspicious. The 'Foo' function is called twice in the specified expression to calculate length of the same string. Explicit conversion from 'float/double' type to unsigned integer type. Possible meaningless check for null, as memory was allocated using 'new' operator. Suspicious return of an always empty collection. MISRA. Thus, these functionsdo not result inundefined behavior. Historically, early returns were frowned upon. The assignment to a member of the readonly field will have no effect when the field is of a value type. Consider inspecting the expression. Type casting is used 2 times in a row. V3042. To use free version of PVS-Studio, source code files are required to start with a special comment. V755. Your function should return a vector in every possible condition. Check for typos and consider using the 'default:' operator instead. Probably it is a mistake. Declaring virtual methods in a class marked as 'final' is pointless. It is suspicious that the argument of sizeof() operator is the expression. Youll need to comment out this line of code in order to make your code compile. Dangerous cast of 'this' to 'void*' type in the 'Base' class, as it is followed by a subsequent cast to 'Class' type. V704. V1058. More than one sizeof() operator is used in one expression. V3132. The variable in the loop exit condition does not change its value between iterations. V2508. V631. V2589. Insecure XML parser is used to process potentially tainted data. 565), Improving the copy in the close modal and post notices - 2023 edition, New blog post from our CEO Prashanth: Community is the future of AI. The value is out of range of enum values. So if you want error for specific warning, say -Wreturn-type, just type return-type without -W part as: $ g++ -Werror=return-type source.cpp In general you should always use -Wall option which includes most common warnings this includes missing return statement also. V651. The 'new type(n)' pattern was detected. V3542. Consider checking the N format items of the 'Foo' function. V549. InvalidClassException may occur during deserialization. V3115. g++ How to get warning on ignoring function return value Value from the uninitialized optional is used. V6085. : **non void function does not return a value in all control paths: **. However, in modern programming they are more accepted, particularly when they can be used to make a function simpler, or are used to abort a function early due to some error condition. V676. V605. V652. Undefined behavior will occur in case of signed integer overflow. V3136. Consider inspecting the 'Foo' function call. An argument containing a file path could be mixed up with another argument. V666. An empty exception handler. One pair of parentheses is unnecessary or misprint is present. V693. V1096. A function with a non-void return type must return an answer no matter what its parameters are. Attempt to release memory that stores the 'Foo' local variable. Variables are initialized through the call to the same function. The 'ThreadStatic' attribute is applied to a non-static 'A' field and will be ignored. Consider inspecting the 'for' operator. Inappropriate attempt to append a null character to a string. A switch-label should only appear at the top level of the compound statement forming the body of a 'switch' statement. The stream is checked for EOF before reading from it but is not checked after reading. Unbounded functions performing string operations should not be used. V3519. V649. V714. V725. Probably meant: '\xNN'. Consider replacing standard container with a different one. @Sneftel Good point. This can result in an overflow. V2520. V1001. V207. The compiler has been asked to warn when a function has a control path that doesn't return a value (although not mentioned in the message, throwing a value and possibly calling a non-returning function may also be considered acceptable). V3528. V3014. It is recommended to use the 'make_unique/make_shared' function to create smart pointers. rev2023.4.21.43403. Variable 'foo' was assigned the same value. Conditional escape sequence in literal. Probably meant: '\xNN'. V2611. C-style and functional notation casts should not be performed. V740. It achieves the same as what you have but it only will add a line instead of modifying the whole function body, and it will be one allocation less ( int val = 0; ). Likewise, report_ratio returns void, so we don't save its return value, either. The 'x' variable is assigned to itself. Such a pointer will become invalid. V760. V202. V2528. Return value is not always used. V3057. Possible incorrect order of arguments passed to function. Two similar code fragments. However, C doesn't require the parentheses. ConcurrentModificationException may occur. V3079. Thus, the warning is a very useful one and you should consider yourself lucky that the compiler noticed the bug. MISRA. We and our partners use cookies to Store and/or access information on a device. Check for typos. The 'X' counter is not used inside a nested loop. A boy can regenerate, so demons eat him for years. It is possible that an incorrect variable is compared with null after type conversion using 'dynamic_cast'. Is the code I've written here adequate to do that? V6099. A function should have a single point of exit at the end. V008. hi, at least for bool keyPressed(ofKeyEventArgs& args) it should return false as the default otherwise the event propagation will stop.. in glTypeForImageType(int imageType)I would simply add return 0; at the end of the function. Bit shifting of the 32-bit value with a subsequent expansion to the 64-bit type. V3553. Part of conditional expression is always true/false. If no return expression is supplied, the Microsoft C runtime returns a value that indicates success (0) or failure (a non-zero value). V713. V3109. Just make it return, @NathanOliver One could imagine a slightly more complex example which was fully reasonable, like. MISRA. An identifier declared in an inner scope should not hide an identifier in an outer scope. V5607. V6068. If you haven't received our response, please do the following: check your Spam/Junk folder and click the Pointer to FILE should not be dereferenced. V2592. Values of different enum types are compared. V5003. Consider inspecting the expression. Bounds should not contain size of a buffer, but a number of characters it can hold. V3097. Declaration should contain no more than two levels of pointer nesting. In lieu of a data type, void functions use the keyword "void." A void function performs a task, and then control returns back to the caller--but, it does not return a value. V2574. V3049. MISRA. V634. Variable was used as a divisor before it was compared to zero. A function should not call itself either directly or indirectly. V773. Decreased performance. It is possible that type name was omitted: throw MyException(a, b);. V825. Consider replacing 'const T' with 'const .. &T' / 'const .. *T'. AUTOSAR. The compiler makes no such assumptions, so you need to make sure that there is a return path that will be followed if the return statement inside your loop . MISRA. Potentially unsafe double-checked locking. Locking operations must be performed on the same thread. Use of the throw (a, b); pattern. Violated order of exception handlers. V2587. This means that the second 'if' statement is senseless. V6083. If a function sometimes forgets to return a result, you will get a warning (if you have requested warnings). Use 'double.IsNaN()' method instead. Such functions are usually marked '[[noreturn]]'. V3130. Code contains invisible characters that may alter its logic. Expression is equivalent to moving one unique pointer to another. It's odd that this method always returns one and the same value of NN. V3172. V508. All memory or resources allocated dynamically should be explicitly released. Currently your code is returning the vector based on conditions. The function argument corresponding to a parameter declared to have an array type should have an appropriate number of elements. Consider replacing the use of 'std::optional::value()' with either the '*' or '->' operator. This can cause concurrency issues. V694. The expression is checked for compatibility with type 'A', but is cast to type 'B'. V671. Use a plain return statement to make your intent clear. The value is out of range of enum values. Find centralized, trusted content and collaborate around the technologies you use most. There should be no occurrence of undefined or critical unspecified behaviour. A smart pointer may not destroy an object correctly. The '&=' operation always sets a value of 'Foo' variable to zero. V3078. Initial and final values of the iterator are the same. Without re-registering for finalization, destructor will not be called a second time on resurrected object. V583. It's better to use '= default;' syntax instead of empty body. V834. V203. Early returns can be used in value-returning functions too: First, print() is called. Check for missing parentheses or use the '&&' or '||' operator. Parameter is always rewritten in function body before being used. The function is used as if it returned a bool type. Decreased performance. The output of the example looks like this: More info about Internet Explorer and Microsoft Edge. Property setter / event accessor does not utilize its 'value' parameter. The 'foo' local variable has the same name as one of class members. V301. Some warnings could have been disabled. Expression containing increment (++) or decrement (--) should not have other side effects. Potential logical error. V6103. What should I follow, if two altimeters show different altitudes? V121. Structures with members of real type are compared byte-wise. Consider using of 'if-else' construct. The consent submitted will only be used for data processing originating from this website. nlohmann/json.hpp:20925:5: warning: non-void function does not return a value in all control paths [-Wreturn-type], const_reference operator[](const typename object_t::key_type& key) const Suspicious declaration. How to Make a Black glass pass light through it? MISRA. To learn more, see our tips on writing great answers. V815. Non-void function must return value. V1045. Consider using parentheses in the expression. V3128. Possible incorrect initialization of variable. Two identical text blocks were detected. The object was used after it was verified against null. V6106. Calling element access method for potentially empty collection may result in exception. Unsafe synchronization on an object. The comma operator should not be used. V051. V6048. Expressions with enum underlying type should have values corresponding to the enumerators of the enumeration. Size of array calculated by sizeof() operator was added to a pointer. In this case, the return value of the called function is undefined. V643. Thanks for contributing an answer to Stack Overflow! V2534. The expression contains a comma. The expression contains a suspicious mix of integer and real types. Flowing off the end of a non-void function with no 'return' results in undefined behavior. The DllMain function throws an exception. The 'strcmp' function returns 0 if corresponding strings are equal. It calls strlen once and either jumps to .L1 or falls through to the then code, which rejoins at .L1. A thread can wait indefinitely or experience a spurious wake-up. Consider inspecting type casting. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. As soon as your program hits that, it will stop executing the loop and return to the main function, performing only a single iteration of the loop. Executing this query may lead to an error. Implicit assignment type conversion to memsize type. The pointer in the expression equals nullptr. V3017. It is possible that a wrong variable is incremented inside the 'for' operator. operator are identical. The expression, if present, is evaluated and then converted to the type returned by the function. V3048. Adding EV Charger (100A) in secondary panel (100A) fed off main (200A). Intermodular analysis may be incomplete, as it is not run on all source files. It causes the function to return to the caller immediately. V794. The SUCCEEDED or FAILED macro should be used instead. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. This condition was already verified in previous line. Size of the 'time_t' type is not 64 bits. V3101. to your account, const typename object_t::key_type& key() const V2016. Casting potential 'null' value to a value type can lead to NullReferenceException. V559. density matrix. V1036. Pointer is compared with 'zero' value. The text was updated successfully, but these errors were encountered: Also, can you provide a minimal code sample that reproduces this issue? V3061. Such a function results in undefined behavior. Passing the value into the 'Foo' method will result in an exception. V2009. A method can return default null value. Ignored InterruptedException could lead to delayed thread shutdown. The original exception object was swallowed. V120. V6101. So GCC knows there is no possible control path that does not return a value, but it reported the warning (elevated to an error) anyway.
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