COMEFROM
unusual, generally humorous control-flow structure in programming
In computer programming, COMEFROM is a control flow statement that causes control flow to jump to the statement after it when control reaches the point specified by the COMEFROM argument. The statement is intended to be the opposite of goto and is considered to be more a joke than serious computer science. Often the specified jump point is identified as a label. For example, COMEFROM x specifies that when control reaches the label x, then control continues at the statement after the COMEFROM.
A major difference with goto is that goto depends on the local structure of the code, while COMEFROM depends on the global structure. A goto statement transfers control when control reaches the statement, but COMEFROM requires the processor (i.e. interpreter) to scan for COMEFROM statements so that when control reaches any of the specified points, the processor can make the jump. The resulting logic tends to be difficult to understand since there is no indication near a jump point that control will in fact jump. One must study the entire program to see if any COMEFROM statements reference that point.
The semantics of a COMEFROM statement varies by programming language. In some languages, the jump occurs before the statement at the specified point is executed and in others the jump occurs after.
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This entry incorporates text from “COMEFROM” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.