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In some languages (e.g. Java [9]) some forms of unreachable code are explicitly disallowed. The optimization that removes unreachable code is known as dead code elimination . Code may become unreachable as a consequence of transformations performed by an optimizing compiler (e.g., common subexpression elimination ).
Mantis Bug Tracker is a free and open source, web-based bug tracking system. The most common use of MantisBT is to track software defects . However, MantisBT is often configured by users to serve as a more generic issue tracking system and project management tool .
Newer programming languages tend to be designed to prevent common bugs based on vulnerabilities of existing languages. Lessons learned from older languages such as BASIC and C are used to inform the design of later languages such as C# and Rust. Languages may include features such as a static type system, restricted namespaces and modular ...
A major component of a bug tracking system is a database that records facts about known bugs. Facts may include the time a bug was reported, its severity, the erroneous program behavior, and details on how to reproduce the bug; as well as the identity of the person who reported it and any programmers who may be working on fixing it.
Early versions of the C++ programming language included an optional mechanism similar to checked exceptions, called exception specifications. By default any function could throw any exception, but this could be limited by a throw clause added to the function signature, that specified which exceptions the function may throw.
A key mechanism for exception safety is a finally clause, or similar exception handling syntax, which ensure that certain code is always run when a block is exited, including by exceptions. Several languages have constructs that simplify this, notably using the dispose pattern, named as using, with, or try-with-resources.
Using these exceptions to handle specific errors that arise to continue the program is called coding by exception. This anti-pattern can quickly degrade software in performance and maintainability. Executing code even after the exception is raised resembles the goto method in many software languages, which is also considered poor practice.
The seminal article by Gill [3] in 1951 is the earliest in-depth discussion of programming errors, but it does not use the term bug or debugging. In the ACM's digital library, the term debugging is first used in three papers from 1952 ACM National Meetings. [4] [5] [6] Two of the three use the term in quotation marks.