Exception handling


In computing and computer programming, exception handling is the process of responding to the occurrence of exceptions – anomalous or exceptional conditions requiring special processing - during the execution of a program. In general, an exception breaks the normal flow of execution and executes a pre-registered exception handler; the details of how this is done depend on whether it is a hardware or software exception and how the software exception is implemented. It is provided by specialized programming language constructs, hardware mechanisms like interrupts, or operating system inter-process communication facilities like signals. Some exceptions, especially hardware ones, may be handled so gracefully that execution can resume where it was interrupted.
An alternative approach to exception handling in software is error checking, which maintains normal program flow with later explicit checks for contingencies reported using special return values, an auxiliary global variable such as Cs errno, or floating point status flags. Input validation, which preemptively filters exceptional cases, is also an approach.

In hardware

Hardware exception mechanisms are processed by the CPU. It is intended to support, e.g., error detection, and redirects the program flow to error handling service routines. The state before the exception is saved, e.g., on the stack.

Hardware exception handling/traps: IEEE 754 floating point

Exception handling in the IEEE 754 floating point hardware standard refers in general to exceptional conditions and defines an exception as "an event that occurs when an operation on some particular operands has no outcome suitable for every reasonable application. That operation might signal one or more exceptions by invoking the default or, if explicitly requested, a language-defined alternate handling."
By default, an IEEE 754 exception is resumable and is handled by substituting a predefined value for different exceptions, e.g. infinity for a divide by zero exception, and providing status flags for later checking of whether the exception occurred. An exception-handling style enabled by the use of status flags involves: first computing an expression using a fast, direct implementation; checking whether it failed by testing status flags; and then, if necessary, calling a slower, more numerically robust, implementation.
The IEEE 754 standard uses the term "trapping" to refer to the calling of a user-supplied exception-handling routine on exceptional conditions, and is an optional feature of the standard. The standard recommends several usage scenarios for this, including the implementation of non-default pre-substitution of a value followed by resumption, to concisely handle removable singularities.
The default IEEE 754 exception handling behaviour of resumption following pre-substitution of a default value avoids the risks inherent in changing flow of program control on numerical exceptions. For example, in 1996 the maiden flight of the Ariane 5 ended in a catastrophic explosion due in part to the Ada programming language exception handling policy of aborting computation on arithmetic error, which in this case was a 64-bit floating point to 16-bit integer conversion overflow. In the Ariane Flight 501 case, the programmers protected only four out of seven critical variables against overflow due to concerns about the computational constraints of the on-board computer and relied on what turned out to be incorrect assumptions about the possible range of values for the three unprotected variables because they reused code from the Ariane 4, for which their assumptions were correct. According to William Kahan, the loss of Flight 501 would have been avoided if the IEEE 754 exception-handling policy of default substitution had been used because the overflowing 64-bit to 16-bit conversion that caused the software to abort occurred in a piece of code that turned out to be completely unnecessary on the Ariane 5. The official report on the crash noted that "An underlying theme in the development of Ariane 5 is the bias towards the mitigation of random failure. The supplier of the inertial navigation system was only following the specification given to it, which stipulated that in the event of any detected exception the processor was to be stopped. The exception which occurred was not due to random failure but a design error. The exception was detected, but inappropriately handled because the view had been taken that software should be considered correct until it is shown to be at fault. Although the failure was due to a systematic software design error, mechanisms can be introduced to mitigate this type of problem. For example the computers within the SRIs could have continued to provide their best estimates of the required attitude information. There is reason for concern that a software exception should be allowed, or even required, to cause a processor to halt while handling mission-critical equipment. Indeed, the loss of a proper software function is hazardous because the same software runs in both SRI units. In the case of Ariane 501, this resulted in the switch-off of two still healthy critical units of equipment."
From the processing point of view, hardware interrupts are similar to resumable exceptions, though they are typically unrelated to the user program's control flow.

Exception handling facilities provided by the operating system

s provide facilities for handling exceptions in programs via IPC. Typically, interrupts caused by the execution of a process are handled by the interrupt service routines of the operating system, and the operating system may then send a signal to that process, which may have asked the operating system to register a signal handler to be called when the signal is raised, or let the operating system execute a default action. Typical examples are SIGSEGV, SIGBUS, SIGILL and SIGFPE.
Other operating systems, e.g., OS/360 and successors, may uses different approaches in place of or in addition to IPC.

In software

Software exception handling and the support provided by software tools differs somewhat from what is understood by exception handling in hardware, but similar concepts are involved. In programming language mechanisms for exception handling, the term exception is typically used in a specific sense to denote a data structure storing information about an exceptional condition. One mechanism to transfer control, or raise an exception, is known as a throw. The exception is said to be thrown. Execution is transferred to a "catch".
From the point of view of the author of a routine, raising an exception is a useful way to signal that a routine could not execute normally - for example, when an input argument is invalid or when a resource it relies on is unavailable, or that the routine has detected a normal condition that requires special handling, e.g., attention, end of file. In systems without exceptions, routines would need to return some special error code. However, this is sometimes complicated by the semipredicate problem, in which users of the routine need to write extra code to distinguish normal return values from erroneous ones.
Programming languages differ substantially in their notion of what an exception is. Contemporary languages can roughly be divided into two groups:
Kiniry also notes that "Language design only partially influences the use of exceptions, and consequently, the
manner in which one handles partial and total failures during system execution. The other major influence is examples of use, typically in core libraries and code examples in technical books, magazine articles, and online discussion forums, and in an organization’s code standards."
Contemporary applications face many design challenges when considering exception handling strategies. Particularly in modern enterprise level applications, exceptions must often cross process boundaries and machine boundaries. Part of designing a solid exception handling strategy is recognizing when a process has failed to the point where it cannot be economically handled by the software portion of the process.

History

Software exception handling developed in Lisp in the 1960s and 1970s. This originated in LISP 1.5, where exceptions were caught by the ERRSET keyword, which returned NIL in case of an error, instead of terminating the program or entering the debugger. Error raising was introduced in MacLisp in the late 1960s via the ERR keyword. This was rapidly used not only for error raising, but for non-local control flow, and thus was augmented by two new keywords, CATCH and THROW, reserving ERRSET and ERR for error handling. The cleanup behavior now generally called "finally" was introduced in NIL in the mid- to late-1970s as UNWIND-PROTECT. This was then adopted by Common Lisp. Contemporary with this was dynamic-wind in Scheme, which handled exceptions in closures. The first papers on structured exception handling were and. Exception handling was subsequently widely adopted by many programming languages from the 1980s onward.
PL/I used dynamically scoped exceptions, however more recent languages use lexically scoped exceptions. PL/I exception handling included events that are not errors, e.g., attention, end-of-file, modification of listed variables. While some more recent languages support non-error exceptions, their use is not common.
Originally, software exception handling included both resumable exceptions, like most hardware exceptions, and non-resumable exceptions. However, resumption semantics were considered ineffective in practice in the 1970s and 1980s and are no longer in common use, though provided by programming languages like Common Lisp,Dylan and PL/I.

Termination semantics

Exception handling mechanisms in contemporary languages are typically non-resumable as opposed to hardware exceptions, which are typically resumable. This is based on experience of using both, as there are theoretical and design arguments in favor of either decision; these were extensively debated during C++ standardization discussions 1989–1991, which resulted in a definitive decision for termination semantics. On the rationale for such a design for the C++ mechanism, Stroustrup notes:

Criticism

A contrasting view on the safety of exception handling was given by Tony Hoare in 1980, describing the Ada programming language as having "...a plethora of features and notational conventions, many of them unnecessary and some of them, like exception handling, even dangerous. Do not allow this language in its present state to be used in applications where reliability is critical . The next rocket to go astray as a result of a programming language error may not be an exploratory space rocket on a harmless trip to Venus: It may be a nuclear warhead exploding over one of our own cities."
Exception handling is often not handled correctly in software, especially when there are multiple sources of exceptions; data flow analysis of 5 million lines of Java code found over 1300 exception handling defects.
Citing multiple prior studies by others and their own results, Weimer and Necula wrote that a significant problem with exceptions is that they "create hidden control-flow paths that are difficult for programmers to reason about".
Go was initially released with exception handling explicitly omitted, with the developers arguing that it obfuscated control flow. Later, the exception-like / mechanism was added to the language, which the Go authors advise using only for unrecoverable errors that should halt the entire process.
Exceptions, as unstructured flow, increase the risk of resource leaks or inconsistent state. There are various techniques for resource management in the presence of exceptions, most commonly combining the dispose pattern with some form of unwind protection, which automatically releases the resource when control exits a section of code.

Exception support in programming languages

Many computer languages have built-in support for exceptions and exception handling. This includes ActionScript, Ada, BlitzMax, C++, C#, Clojure, COBOL, D, ECMAScript, Eiffel, Java, ML, Next Generation Shell, Object Pascal, PowerBuilder, Objective-C, OCaml, PHP, PL/I, PL/SQL, Prolog, Python, REALbasic, Ruby, Scala, Seed7, Smalltalk, Tcl, Visual Prolog and most.NET languages. Exception handling is commonly not resumable in those languages, and when an exception is thrown, the program searches back through the stack of function calls until an exception handler is found.
Some languages call for unwinding the stack as this search progresses. That is, if function, containing a handler for exception, calls function, which in turn calls function, and an exception occurs in, then functions and may be terminated, and in will handle.
Exception-handling languages without this unwinding are Common Lisp with its Condition System, PL/I and Smalltalk. All call the exception handler and do not unwind the stack; however, in PL/I, if the "ON unit" does a GOTO out of the ON unit, that will unwind the stack. The exception handler has the option to restart the computation, resume or unwind. This allows the program to continue the computation at exactly the same place where the error occurred or to implement notifications, logging, queries and fluid variables on top of the exception handling mechanism. The stackless implementation of the Mythryl programming language supports constant-time exception handling without stack unwinding.
Excluding minor syntactic differences, there are only a couple of exception handling styles in use. In the most popular style, an exception is initiated by a special statement with an exception object or a value of a special extendable enumerated type. The scope for exception handlers starts with a marker clause and ends in the start of the first handler clause. Several handler clauses can follow, and each can specify which exception types it handles and what name it uses for the exception object.
A few languages also permit a clause that is used in case no exception occurred before the end of the handler's scope was reached.
More common is a related clause that is executed whether an exception occurred or not, typically to release resources acquired within the body of the exception-handling block. Notably, C++ does not provide this construct, since it encourages the Resource Acquisition Is Initialization technique which frees resources using destructors.
In its whole, exception handling code might look like this :

try
catch
catch
finally

As a minor variation, some languages use a single handler clause, which deals with the class of the exception internally.
According to a 2008 paper by Westley Weimer and George Necula, the syntax of the try...finally blocks in Java is a contributing factor to software defects. When a method needs to handle the acquisition and release of 3–5 resources, programmers are apparently unwilling to nest enough blocks due to readability concerns, even when this would be a correct solution. It is possible to use a single try...finally block even when dealing with multiple resources, but that requires a correct use of sentinel values, which is another common source of bugs for this type of problem. Regarding the semantics of the try...catch...finally construct in general, Weimer and Necula write that "While try-catch-finally is conceptually simple, it has the most complicated execution description in the language specification and requires four levels of nested “if”s in its official English description. In short, it contains a large number of corner cases that programmers often overlook."
C supports various means of error checking, but generally is not considered to support "exception handling," although the setjmp and longjmp standard library functions can be used to implement exception semantics.
Perl has optional support for structured exception handling.
Python's support for exception handling is pervasive and consistent. It's difficult to write a robust Python program without using its and keywords.

Exception handling in UI hierarchies

Recent front-end web frameworks, such as React and Vue, have introduced error handling mechanisms where errors propagate up the UI component hierarchy, in a way that is analogous to how errors propagate up the call stack in executing code. Here the error boundary mechanism serves as an analogue to the typical try-catch mechanism. Thus a component can ensure that errors from its child components are caught and handled, and not propagated up to parent components.
For example, in Vue, a component would catch errors by implementing errorCaptured
Vue.component
Vue.component
When used like this in markup:



The error produced by the child component is caught and handled by the parent component.

Exception handling implementation

The implementation of exception handling in programming languages typically involves a fair amount of support from both a code generator and the runtime system accompanying a compiler. Two schemes are most common. The first, dynamic registration, generates code that continually updates structures about the program state in terms of exception handling. Typically, this adds a new element to the stack frame layout that knows what handlers are available for the function or method associated with that frame; if an exception is thrown, a pointer in the layout directs the runtime to the appropriate handler code. This approach is compact in terms of space, but adds execution overhead on frame entry and exit. It was commonly used in many Ada implementations, for example, where complex generation and runtime support was already needed for many other language features. Dynamic registration, being fairly straightforward to define, is amenable to proof of correctness.
The second scheme, and the one implemented in many production-quality C++ compilers, is a table-driven approach. This creates static tables at compile time and link time that relate ranges of the program counter to the program state with respect to exception handling. Then, if an exception is thrown, the runtime system looks up the current instruction location in the tables and determines what handlers are in play and what needs to be done. This approach minimizes executive overhead for the case where an exception is not thrown. This happens at the cost of some space, but this space can be allocated into read-only, special-purpose data sections that are not loaded or relocated until an exception is actually thrown. This second approach is also superior in terms of achieving thread safety.
Other definitional and implementation schemes have been proposed as well. For languages that support metaprogramming, approaches that involve no overhead at all have been advanced.

Exception handling based on design by contract

A different view of exceptions is based on the principles of design by contract and is supported in particular by the Eiffel language. The idea is to provide a more rigorous basis for exception handling by defining precisely what is "normal" and "abnormal" behavior. Specifically, the approach is based on two concepts:
The "Safe Exception Handling principle" as introduced by Bertrand Meyer in Object-Oriented Software Construction then holds that there are only two meaningful ways a routine can react when an exception occurs:
In particular, simply ignoring an exception is not permitted; a block must either be retried and successfully complete, or propagate the exception to its caller.
Here is an example expressed in Eiffel syntax. It assumes that a routine is normally the better way to send a message, but it may fail, triggering an exception; if so, the algorithm next uses, which will fail less often. If fails, the routine as a whole should fail, causing the caller to get an exception.

send is
-- Send m through fast link, if possible, otherwise through slow link.
local
tried_fast, tried_slow: BOOLEAN
do
if tried_fast then
tried_slow := True
send_slow
else
tried_fast := True
send_fast
end
rescue
if not tried_slow then
retry
end
end

The boolean local variables are initialized to False at the start. If fails, the body will be executed again, causing execution of. If this execution of fails, the clause will execute to the end with no , causing the routine execution as a whole to fail.
This approach has the merit of defining clearly what "normal" and "abnormal" cases are: an abnormal case, causing an exception, is one in which the routine is unable to fulfill its contract. It defines a clear distribution of roles: the clause is in charge of achieving, or attempting to achieve, the routine's contract; the clause is in charge of reestablishing the context and restarting the process, if this has a chance of succeeding, but not of performing any actual computation.
Although exceptions in Eiffel have a fairly clear philosophy, Kiniry criticizes their implementation because "Exceptions that are part of the language definition are represented by INTEGER values, developer-defined exceptions by STRING values. Additionally, because they are basic values and not objects, they have no inherent semantics beyond that which is expressed in a helper routine which necessarily cannot be foolproof because of the representation overloading in effect."

Uncaught exceptions

If an exception is thrown and not caught, the uncaught exception is handled by the runtime; the routine that does this is called the . The most common default behavior is to terminate the program and print an error message to the console, usually including debug information such as a string representation of the exception and the stack trace. This is often avoided by having a top-level handler that catches exceptions before they reach the runtime.
Note that even though an uncaught exception may result in the program terminating abnormally, the process terminates normally, as the runtime can ensure orderly shutdown of the process.
In a multithreaded program, an uncaught exception in a thread may instead result in termination of just that thread, not the entire process. This is particularly important for servers, where for example a servlet can be terminated without the server overall being affected.
This default uncaught exception handler may be overridden, either globally or per-thread, for example to provide alternative logging or end-user reporting of uncaught exceptions, or to restart threads that terminate due to an uncaught exception. For example, in Java this is done for a single thread via and globally via ; in Python this is done by modifying .

Static checking of exceptions

Checked exceptions

The designers of Java devised checked exceptions, which are a special set of exceptions. The checked exceptions that a method may raise are part of the method's signature. For instance, if a method might throw an, it must declare this fact explicitly in its method signature. Failure to do so raises a compile-time error.
Kiniry notes however that Java's libraries were often inconsistent in their approach to error reporting, because "Not all erroneous situations in Java are represented by exceptions though. Many methods return special values which indicate failure encoded as constant field of related classes."
Checked exceptions are related to exception checkers that exist for the OCaml programming language. The external tool for OCaml is both invisible and optional.
The CLU programming language had a feature with the interface closer to what Java has introduced later. A function could raise only exceptions listed in its type, but any leaking exceptions from called functions would automatically be turned into the sole runtime exception,, instead of resulting in compile-time error. Later, Modula-3 had a similar feature. These features don't include the compile time checking that is central in the concept of checked exceptions, and hasn't been incorporated into major programming languages other than Java.
Early versions of the C++ programming language included an optional mechanism for checked exceptions, called exception specifications. By default any function could throw any exception, but this was limited by a clause added to the function signature, that specified which exceptions the function may throw. Exception specifications were not enforced at compile-time. Violations resulted in the global function being called. An empty exception specification could be given, which indicated that the function will throw no exception. This was not made the default when exception handling was added to the language because it would have required too much modification of existing code, would have impeded interaction with code written in other languages, and would have tempted programmers into writing too many handlers at the local level. Explicit use of empty exception specifications could, however, allow C++ compilers to perform significant code and stack layout optimizations that generally have to be suppressed when exception handling may take place in a function. Some analysts viewed the proper use of exception specifications in C++ as difficult to achieve. In the C++ language standard, this use of exception specifications as specified in the C++03 version of the standard was deprecated and was removed from the language in C++17. A function that will not throw any exceptions can now be denoted by the noexcept keyword.
In contrast to Java, languages like C# do not require declaration of any exception type. According to Hanspeter Mössenböck, not distinguishing between to-be-called exceptions and not-to-be-called exceptions makes the written program more convenient, but less robust, as an uncaught exception results in an abort with a stack trace. Kiniry notes however that Java's JDK throws a large number of unchecked exceptions: one for every 140 lines of code, whereas Eiffel uses them much more sparingly, with one thrown every 4,600 lines of code. Kiniry also writes that "As any Java programmer knows, the volume of try catch code in a typical Java application is sometimes larger than the comparable code necessary for explicit formal parameter and return value checking in other languages that do not have checked exceptions. In fact, the general consensus among in-the-trenches Java programmers is that dealing with checked exceptions is nearly as unpleasant a task as writing documentation. Thus, many programmers report that they “resent” checked exceptions. This leads to an abundance of checked-but-ignored exceptions". Kiniry also notes that the developers of C# apparently were influenced by this kind of user experiences, with the following quote being attributed to them : According to Anders Hejlsberg there was fairly broad agreement in their design group to not have checked exceptions as a language feature in C#. Hejlsberg explained in an interview that

Views on usage

Checked exceptions can, at compile time, reduce the incidence of unhandled exceptions surfacing at runtime in a given application. Unchecked exceptions remain unhandled.
However, checked exceptions can either require extensive declarations, revealing implementation details and reducing encapsulation, or encourage coding poorly considered blocks that can hide legitimate exceptions from their appropriate handlers. Consider a growing codebase over time. An interface may be declared to throw exceptions X and Y. In a later version of the code, if one wants to throw exception Z, it would make the new code incompatible with the earlier uses. Furthermore, with the adapter pattern, in which one body of code declares an interface that is then implemented by a different body of code so that code can be plugged in and called by the first, the adapter code may have a rich set of exceptions to describe problems, but is forced to use the exception types declared in the interface.
It is possible to reduce the number of declared exceptions either by declaring a superclass of all potentially thrown exceptions, or by defining and declaring exception types that are suitable for the level of abstraction of the called method and mapping lower level exceptions to these types, preferably wrapped using exception chaining in order to preserve the root cause. In addition, it's very possible that in the example above of the changing interface that the calling code would need to be modified as well, since in some sense the exceptions a method may throw are part of the method's implicit interface anyway.
Using a declaration or is usually sufficient for satisfying the checking in Java. While this may have some use, it essentially circumvents the checked exception mechanism, which Oracle discourages.
Unchecked exception types should generally not be handled, except possibly at the outermost levels of scope. These often represent scenarios that do not allow for recovery: s frequently reflect programming defects, and s generally represent unrecoverable JVM failures. Even in a language that supports checked exceptions, there are cases where the use of checked exceptions is not appropriate.

Dynamic checking of exceptions

The point of exception handling routines is to ensure that the code can handle error conditions. In order to establish that exception handling routines are sufficiently robust, it is necessary to present the code with a wide spectrum of invalid or unexpected inputs, such as can be created via software fault injection and mutation testing. One of the most difficult types of software for which to write exception handling routines is protocol software, since a robust protocol implementation must be prepared to receive input that does not comply with the relevant specification.
In order to ensure that meaningful regression analysis can be conducted throughout a software development lifecycle process, any exception handling testing should be highly automated, and the test cases must be generated in a scientific, repeatable fashion. Several commercially available systems exist that perform such testing.
In runtime engine environments such as Java or.NET, there exist tools that attach to the runtime engine and every time that an exception of interest occurs, they record debugging information that existed in memory at the time the exception was thrown. These tools are called automated exception handling or error interception tools and provide 'root-cause' information for exceptions.

Exception synchronicity

Somewhat related with the concept of checked exceptions is exception synchronicity. Synchronous exceptions happen at a specific program statement whereas asynchronous exceptions can raise practically anywhere. It follows that asynchronous exception handling can't be required by the compiler. They are also difficult to program with. Examples of naturally asynchronous events include pressing Ctrl-C to interrupt a program, and receiving a signal such as "stop" or "suspend" from another thread of execution.
Programming languages typically deal with this by limiting asynchronicity, for example Java has deprecated the use of its ThreadDeath exception that was used to allow one thread to stop another one. Instead, there can be semi-asynchronous exceptions that only raise in suitable locations of the program or synchronously.

Condition systems

, Dylan and Smalltalk have a condition system that encompasses the aforementioned exception handling systems. In those languages or environments the advent of a condition implies a function call, and only late in the exception handler the decision to unwind the stack may be taken.
Conditions are a generalization of exceptions. When a condition arises, an appropriate condition handler is searched for and selected, in stack order, to handle the condition. Conditions that do not represent errors may safely go unhandled entirely; their only purpose may be to propagate hints or warnings toward the user.

Continuable exceptions

This is related to the so-called resumption model of exception handling, in which some exceptions are said to be continuable: it is permitted to return to the expression that signaled an exception, after having taken corrective action in the handler. The condition system is generalized thus: within the handler of a non-serious condition, it is possible to jump to predefined restart points that lie between the signaling expression and the condition handler. Restarts are functions closed over some lexical environment, allowing the programmer to repair this environment before exiting the condition handler completely or unwinding the stack even partially.
An example is the ENDPAGE condition in PL/I; the ON unit might write page trailer lines and header lines for the next page, then fall through to resume execution of the interrupted code.

Restarts separate mechanism from policy

Condition handling moreover provides a separation of mechanism from policy. Restarts provide various possible mechanisms for recovering from error, but do not select which mechanism is appropriate in a given situation. That is the province of the condition handler, which has access to a broader view.
An example: Suppose there is a library function whose purpose is to parse a single syslog file entry. What should this function do if the entry is malformed? There is no one right answer, because the same library could be deployed in programs for many different purposes. In an interactive log-file browser, the right thing to do might be to return the entry unparsed, so the user can see it—but in an automated log-summarizing program, the right thing to do might be to supply null values for the unreadable fields, but abort with an error, if too many entries have been malformed.
That is to say, the question can only be answered in terms of the broader goals of the program, which are not known to the general-purpose library function. Nonetheless, exiting with an error message is only rarely the right answer. So instead of simply exiting with an error, the function may establish restarts offering various ways to continue—for instance, to skip the log entry, to supply default or null values for the unreadable fields, to ask the user for the missing values, or to unwind the stack and abort processing with an error message. The restarts offered constitute the mechanisms available for recovering from error; the selection of restart by the condition handler supplies the policy.