You can return a value from a Function procedure in any of the following ways: Include the value in a Return Statement. for example: void throw_blah () { throw "blah"; } int foo () { throw_blah (); } I am pretty curious about this as this is directly related to one of my other issue . Flexible array members should not be declared. V1080. V822. It is odd that the body of 'Foo_1' function is fully equivalent to the body of 'Foo_2' function. The 'switch' statement should have 'default' as the last label. V2516. Consider using the 'size()' function. Do not use old versions of SSL/TLS protocols as it may cause security issues. V625. V3129. V771. Well occasionally send you account related emails. The 'if' 'else if' construct should be terminated with an 'else' statement. V795. V3023. The function argument corresponding to a parameter declared to have an array type should have an appropriate number of elements. Check items X, Y, Z, in lines N1, N2, N3, V526. Incorrect index type: 'foo[not a memsize-type]'. Consider allocating it on the stack instead. V563. V834. The 'if (ptr != NULL)' check can be removed. AUTOSAR. Insecure XML parser is used to process potentially tainted data. V1014. Consider inspecting signed and unsigned function arguments. V6019. Upper bound of case range is less than its lower bound. This program prints the letters A and B on separate lines. V530. Continue with Recommended Cookies. 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.. The 'X' variable was not initialized. Size of the 'time_t' type is not 64 bits. Inspect the program's logic. Use a plain return statement to make your intent clear. V5305. the platforms: Continuous use of the analyzer in software development, Deploying the analyzer in cloud Continuous Integration services, Additional configuration and resolving issues. Possible overflow. The expression contains a suspicious mix of integer and real types. OWASP. MISRA. Connect and share knowledge within a single location that is structured and easy to search. V3160. A minor scale definition: am I missing something? Suspicious subexpression in a sequence of similar comparisons. V2517. Implicit assignment type conversion to memsize type. V760. V538. Only the first member of enumerator list should be explicitly initialized, unless all members are explicitly initialized. Number of elements in the allocated array equals the size of a pointer in bytes. In this case, we have the 'main' function. Dereferencing the result of 'as' operator can lead to NullReferenceException. V793. V2550. Member invocation on this value may lead to an exception. MISRA. V741. No return statement is required. Consider verifying the compatibility of 32 and 64 bit versions of the application in the context of a stored data. Bit shifting of the 32-bit value with a subsequent expansion to the 64-bit type. Consider replacing the use of 'std::optional::value()' with either the '*' or '->' operator. The standard input/output functions should not be used. The expression is excessive or contains a logical error. V731. Subtraction, >, >=, <, <= should be applied only to pointers that address elements of the same array. The '&=' operation always sets a value of 'Foo' variable to zero. Use of a pointer to FILE when the associated stream has already been closed. Consider reviewing 'X'. Connect and share knowledge within a single location that is structured and easy to search. An early return is a return statement that occurs before the last line of a function. As your code stands, if candidate_count is greater than 0 the loop will iterate once and then unconditionally return false, which I don't think is what you want. Possible path traversal vulnerability. It is likely that a wrong variable is being compared inside the 'for' operator. V3033. As the diagnostic message states, the function does have a control path where a value isn't returned. The original exception object was swallowed. V812. It is possible that a typo is present inside the expression. Abnormality within similar comparisons. Executing this query may lead to an error. MISRA. Potentially tainted data is used as a path. The 'while' operator has empty body. The 'throw' keyword could be missing. V763. V592. V1006. Generating points along line with specifying the origin of point generation in QGIS. V552. V507. For example: In the above example, the printHi function has a useful behavior (it prints Hi) but it doesnt need to return anything back to the caller. V559. The 'X' counter is not used inside a nested loop. V828. The assignment to a member of the readonly field will have no effect when the field is of a value type. We and our partners use cookies to Store and/or access information on a device. V644. If you have a C++ program missing a return statement from a function that is supposed to return a value, g++ will compile it happily with no errors (or even a warning, unless -Wreturn-type or -Wall is used). This may lead to undefined behavior. Value of 'A' type is assigned to a pointer of 'B' type. An excessive expression. Empirical analysis. In such a case, the comparison operation can potentially behave unexpectedly. V3096. It is complaining because within the first for loop, if block returns v but else if block does not return anything. Variable is not passed into foreach loop by reference, but its value is changed inside of the loop. V786. The first statement in print() prints A. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. A return statement can return a value to the calling function. V693. V3010. I am getting this error when trying to compile the below code. V573. Unchecked tainted data is used in expression. OWASP. AUTOSAR. An overflow of the 32-bit variable is possible inside a long cycle which utilizes a memsize-type loop counter. To learn more, see our tips on writing great answers. A value of variable is not modified. V3050. Email? Incorrect format. MISRA. V611. Suspicious pointer arithmetic with 'malloc/new'. The value from the uninitialized optional is used. AUTOSAR. V2614. AUTOSAR. Consider using the declaration from system header files instead. Line splice results in a character sequence that matches the syntax of a universal-character-name. V2511. The 'switch' statement should have 'default' as the last label. V681. V3114. AUTOSAR. Checking value for null will always return false when generic type is instantiated with a value type. Perhaps another variable should be incremented instead. It makes code less human error prone. Identical expression to the left and to the right of compound assignment. V575. It is suspicious that the result of the statement is a part of the condition. Shift by N bits is inconsistent with the size of type. Suspicious assignment inside the condition expression of 'if/while/for' operator. V3123. Consider inspecting the loop expression. The variable from the loop exit condition does not change its value between iterations. Pointer to FILE should not be dereferenced. The report_ratio function has a void return type, so it doesn't need to explicitly return a value. From the documentation of JSON_THROW_USER: Note that JSON_THROW_USER should leave the current scope (e.g., by throwing or aborting), as continuing after it may yield undefined behavior. MISRA. V2579. It's possible that the line was commented out improperly, thus altering the program's operation logics. The variable is assigned the same value on several loop iterations. The 'zero' value is assigned to pointer. Consider inspecting the expression. What's the cheapest way to buy out a sibling's share of our parents house if I have no cash and want to pay less than the appraised value? Examine the substrings "abc" and "abcd". V6081. Possible log injection. Value of 'char' type is added to a string pointer. It is possible that different variables are used inside initializer and iterator. Consider inspecting usage of 'Y' counter. Decreased performance. There should be no implicit integral-floating conversion. V3046. V113. OWASP. Further, testing by changing the function return type to int and changing the returns to 0 in the then code, 1 in the else if code, and 2 outside that shows assembly code that only returns 0 or 1, proving GCC was not just collapsing the third path into undefined behavior; it outright eliminates it because it is not possible. V1085. Execution resumes in the calling function at the point immediately following the call. V2012. Unsafe invocation of event, NullReferenceException is possible. Non-atomic modification of volatile variable. V6001. The '!=' operator should probably be used here. V001. V727. Potentially tainted data is used to create SQL command. Exception was thrown by pointer. Operand of sizeof() operator should not have other side effects. How to force Mathematica to return `NumericQ` as True when aplied to some variable in Mathematica? The variable was utilized in the logical expression before it was verified against null in the same logical expression. V578. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide, FWIW, compiling the example code on godbolt.org with, @EricPostpischil but compiler does not know if, Yes, it does know. It is more efficient to catch exception by reference rather than by value. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. AUTOSAR. V6028. V1016. Functions should be declared in prototype form with named parameters. V3037. Non-atomic modification of volatile variable. V2551. V2509. Consider checking the N format items of the 'Foo' function. One is enough. At the end of printHi, control returns to main and the program proceeds. V6066. I am trying to understand the C++(GCC compiler) expectation of return statement in a non-void function. OWASP. Passing these values into the method will result in an exception. If you called exit instead of throw_blah from foo, for instance, it wouldn't issue the error. Suspicious comparison found: 'a == b == c'. Interpreting non-statistically significant results: Do we have "no evidence" or "insufficient evidence" to reject the null? Empirical analysis. V3546. Correction-related comments will be deleted after processing to help reduce clutter. Features from should not be used. Why don't we use the 7805 for car phone chargers? V2529. Probably it is a mistake. V6032. The expression is always false. Consider checking the first actual argument of the 'Foo' method. V523. V1059. The 'continue' operator will terminate 'do { } while (false)' loop because the condition is always false. The stream is checked for EOF before reading from it but is not checked after reading. MISRA. V3512. The resulting value may be inaccurate. Calling an overridden method in parent-class constructor may lead to use of uninitialized data. The global namespace should only contain 'main', namespace declarations and 'extern "C"' declarations. Declaration should contain no more than two levels of pointer nesting. Getting "non-void function does not return a value in all control paths", New blog post from our CEO Prashanth: Community is the future of AI, Improving the copy in the close modal and post notices - 2023 edition, Embedded hyperlinks in a thesis or research paper. V110. Site design / logo 2023 Stack Exchange Inc; user contributions licensed under CC BY-SA. The 'foo' word is suspicious. V810. An example of data being processed may be a unique identifier stored in a cookie. The values used in expressions should have appropriate essential types. V6018. Suspicious division. :' operator, regardless of its conditional expression, always returns the same value. V3149. As a good engineering practice, always specify a return type for your functions. However, C doesn't require the parentheses. What differentiates living as mere roommates from living in a marriage-like relationship? V3185. V586. Reference was invalidated because of destruction of the temporary object returned by the function. A pattern was detected: A || (A && ). How do I count the number of sentences in C using ". OWASP. Floating-point values should not be tested for equality or inequality. V777. Range intersections are possible within conditional expressions. Use of outdated cryptographic algorithm is not recommended. AUTOSAR. If you haven't received our response, please do the following: check your Spam/Junk folder and click the Suspicious access to element by a constant index inside a loop. The function located to the right of the '|' and '&' operators will be called regardless of the value of the left operand. V587. V6034. Object should not be assigned or copied to an overlapping object. From what I can gather online, this means that I am not returning a value from my function? Absolute values of both operands are equal. V008. V220. It is possible that a typo is present inside the expression. WPF: the names of the property registered for DependencyProperty, and of the property used to access it, do not correspond with each other. MISRA. The 'A' class containing IDisposable members does not itself implement IDisposable. The object was created but it is not being used. V759. V2538. Error message contains potentially sensitive data that may be exposed. V011. Use of '\0xNN' characters. OWASP. The right operand is greater than or equal to the number of bits in the left operand. The 'a' variable was used after it was assigned through null-conditional operator. V1082. Consider inspecting the expression. Probably the '!='/'-='/'+=' should be used here. MISRA. Are you missing a 'Return' statement? V770. Suspicious getter/setter implementation. V2547. V1048. Pointer was used unsafely after its check for nullptr. V2569. Its representation is implementation-defined. Lowercase 'L' at the end of a long literal can be mistaken for '1'. This may lead to undefined behavior. The return value of the function should probably be compared with std::string::npos. The ratio function returns the ratio of its two int arguments as a floating-point double value. Recurrent serialization will use cached object state from first serialization. Function receives an odd argument. V527. Since the function doesnt return a value, this is fine. V817. OWASP. MISRA. V698. The other reason is that void more clearly conveys that the function is supposed to not return a value, rather than return null specifically. : **non void function does not return a value in all control paths: **. Recursive function call during the static/thread_local variable initialization might occur. V6095. The 'a % b' expression always evaluates to 0. Check lines: N1, N2. Unsafe double-checked locking. Calling method or accessing property of potentially disposed object may result in exception. Object may be created in-place in a container. Suspicious precise comparison. Note that throw_blah is the weird bit, not foo. V3184. V3108. V805. MISRA. It is possible that a wrong variable is incremented inside the 'for' operator. V794. and '.' Odd use of special character in regular expression. There is nothing we can do in this situation - there are no default values to return in case of exceptions. Suspicious subexpression in a sequence of similar comparisons. V3170. A Function procedure has at least one possible path through its code that does not return a value. How to Make a Black glass pass light through it? An argument containing a file path could be mixed up with another argument. V2510. The variable is assigned but is not used by the end of the function. . Return value of 'wcslen' function is not multiplied by 'sizeof(wchar_t)'. 'else' keyword is probably missing. Consider checking the Nth actual argument of the 'Foo' function. Variable with static storage duration is declared inside the inline function with external linkage. The standard signal handling functions should not be used. V118. Initial and final values of the iterator are the same. Was Aristarchus the first to propose heliocentrism? I agree. If an expression is not given on a return statement in a function declared with a non- void return type, the compiler issues a warning message. It causes the function to return to the caller immediately. Implicitly specified enumeration constants should be unique consider specifying non-unique constants explicitly. MISRA. MISRA. This means that the second 'if' statement is senseless. V690. V536. Has the Melford Hall manuscript poem "Whoso terms love a fire" been attributed to any poetDonne, Roe, or other? V3088. Unary minus operator should not be applied to an expression of the unsigned type. Classes should always be derived from std::exception (and alike) as 'public'. Consider throwing it by value instead. AUTOSAR. i'm not sure if this is intentional behavior. V2543. V778. Cast should not convert pointer to function to any other pointer type. V2531. V1054. Quoting from gcc warning options page: -Wno-unused-result. Parameter is not used inside method's body. Flowing off the end of a non-void function with no 'return' results in undefined behavior. The square function returns the square of its argument, in a wider type to prevent an arithmetic error. V2018. V591. Suspicious return of an always empty collection. V2604. AUTOSAR. V2536. Probably the '-=' should be used here. It is suspicious and can possibly be an error. V3544. Check the following code block after the 'if' statement. Consider inspecting the function call. V3525. V2552. Hi, been using 2.0.1 so far over the proposed workaround (void function instead of non-void function). Expression of the 'A =- B' kind is used. V827. The 'X' counter is not used inside a nested loop. The expression is excessive or contains a misprint. V3052. V5616. Potentially tainted data is used to create query. V1068. std::cout), a value must be provided. V502. The 'alloca' function is used inside the loop. V1081. A write outside the bounds of this variable may occur. V120. Nonsensical comparison: pointer < 0. Function returns pointer/reference to temporary local object. V729. V545. Parameter is not used inside function's body. V6057. N operand of '? Typedef names should be unique across all name spaces. V6072. V505. Consider inspecting the '? Unary minus operator does not modify a bool type value. Have a question about this project? V584. Pointer was used in the logical expression before its check for nullptr in the same logical expression. More than N bits are required to store the value, but the expression evaluates to the T type which can only hold K bits. A part of conditional expression is always true/false if it is evaluated. The code can be rewritten as either: Although you report testing the former option, GCC will not report the warning in this case, so I believe your test was faulty, such as compiling code other than what you intended to compile. Variable is used after it is moved. In such a case, the comparison operation may behave unexpectedly. N argument has memsize type. Potentially tainted data is written into logs. The reason for the error/warning message is because a void function, by definition, does not return a value. Moving an object in a return statement prevents copy elision. Consider inspecting the expression. Variable length array types are not allowed. V3077. It is possible that these are misprints and 'default:' label should be used instead. V106. V3536. MISRA. The comma operator should not be used. Non-void functions are required to have a return type. Implicit conversion of the type of 'new' operator's argument to size_t type. Consider inspecting conditional expression of the loop. MISRA. Potentially tainted data is used to create OS command. Boundary between numeric escape sequence and string is unclear. Consider checking the function for an error. The expression is checked for compatibility with the type 'A', but is casted to the 'B' type. V2016. The .exe and .i files are not supported. V673. Possible dereference of invalid iterator 'X'. Function exited without performing epilogue actions. Operation is executed 3 or more times in a row. Making statements based on opinion; back them up with references or personal experience. V724. MISRA. V2603. Two opposite conditions were encountered. AUTOSAR. Unsafe usage of the 'bool' and integer types together in the operation '&='. V657. V1021. The 'static' keyword shall not be used between [] in the declaration of an array parameter. V2015. V5006. V6012. MISRA. V602. V2568. V201. Consider inspecting this expression. Macro expression is dangerous or suspicious. Object was created but not used. An abnormality within similar comparisons. AUTOSAR. V789. V541. Consider inspecting virtual function arguments. MISRA. Consider reviewing 'X'. More info about Internet Explorer and Microsoft Edge, Compile Page, Project Designer (Visual Basic). To view the purposes they believe they have legitimate interest for, or to object to this data processing use the vendor list link below. V2520. The size of the bit mask is less than the size of the first operand. OWASP. V128. An unconditional 'break/continue/return/goto' within a loop. V751. OWASP. MISRA. V599. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. MISRA. 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). V565. Possible incorrect order of arguments passed to method. V6041. great work. The total size limit is 20MB. This causes unspecified or undefined behavior. Decreased performance. A pointer/reference parameter in a function should be declared as pointer/reference to const if the corresponding object was not modified. It is possible literal was intended to belong to '??' V1051. V5620. MISRA. V585. The 'sizeof' expression returns the size of the container type, not the number of elements. Locking operations must be performed on the same thread. V3186. When we call a function by itself (e.g. The object was created but it is not being used. Uninitialized class member is used when initializing the base class. V616. V560. Consider assigning realloc() to a temporary pointer. MISRA. Expression under 'throw' is a potential null, which can lead to NullReferenceException. MISRA. Recurring check. It is possible that '1' should be present instead of '0'. V3140. V207. Use of uninitialized variable 'Foo'. 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. V1017. Storing credentials inside source code can lead to security issues. AUTOSAR. More than one sizeof() operator is used in one expression. V579. operators are used for accessing members of the same object. Maximum size of a vector is known at compile time. V1037. Converting integers or pointers to BOOL can lead to a loss of high-order bits. Is it safe to publish research papers in cooperation with Russian academics? ConcurrentModificationException may occur. Usage of non memsize type for pointer arithmetic. Pointer is dereferenced on the initialization list before its check for null inside the body of a constructor function. V1012. V2501. The alignment rules and type sizes have been changed. V1015. The object was created but it is not being used. Consider inspecting the expression. Consider checking for misprints. MISRA. V5622. Suspicious type cast: 'Type1' to ' Type2'. Do not use real-type variables as loop counters. The code fragment is equivalent to the following: Note that undefined behavior occurs only if the end of a non-void function is actually reached. 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. Let's consider an example: V3068. Not the answer you're looking for? Attempt to free memory containing the 'int A[10]' array by using the 'free(A)' function. V108. V749. Waiting on condition variable without predicate. Could a subterranean river or aquifer generate enough continuous momentum to power a waterwheel for the purpose of producing electricity? V6017. in your code compiler does not know if the key will not be changed in the call to strlen as you pass a pointer (side effects). External object or function should be declared once in one and only one file. Octal and hexadecimal escape sequences should be terminated. V3030. OWASP. Object was created but is not used. Length should be probably multiplied by sizeof(wchar_t). V2537. Suspicious access to element by a constant index inside a loop. MISRA. V744. Expression 'A = B == C' is calculated as 'A = (B == C)'. Expression is enclosed by parentheses twice: ((expression)). One of the function's arguments has the same name and this argument is a reference. V5010. Constant value is represented by an octal form. Unexpected uint64 behaviour 0xFFFF'FFFF'FFFF'FFFF - 1 = 0? Suspicious string consisting of two parts is used for initialization. Macro should not be defined with the same name as a keyword. V3066. 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. Decreased performance. V5302. V5623. The 'x' variable is assigned to itself. Consider using 'std::move' instead. The expression was implicitly cast from integer type to real type. V6022. V765. By default, this message is a warning. Empty exception handler. V3107. Why are players required to record the moves in World Championship Classical games? It is more efficient to use an initialization list rather than an assignment operator. The function with the 'abort/exit/getenv/system' name should not be used. V720. V783. V1065. The conditional expressions of the 'if' statements situated alongside each other are identical. Here is a full example. Constant expression in switch statement. Undefined behavior will occur in case of signed integer overflow. The function located to the right of the '|' and '&' operators will be called regardless of the value of the left operand. What is the Russian word for the color "teal"? OWASP. Consider utilizing an explicit type cast to avoid the loss of a fractional part. Compiler may delete 'memset' function call that is used to clear 'Foo' buffer. Suspicious sequence of assignments: A = B; B = A;. The object of non-passive (non-PDS) type cannot be used with the function. MISRA. V3041. Consider inspecting the 'for' operator. Consider inspecting the expression. V613. An enumeration was declared with 'Flags' attribute, but does not set any initializers to override default values. Consider inspecting the expression.
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