COMEFROM - Definition

In computer programming, COMEFROM is a control flow structure used in some programming languages. Its purpose is roughly the opposite of GOTO, in that it takes the execution state from any arbitrary point in code to a COMEFROM statement. Depending on the language used, multiple COMEFROMs referencing the same departure point may be either invalid or induce parallel execution. It was initially seen in lists of joke assembly language instructions (as 'CMFRM') and was elaborated upon in a Datamation article by R. Lawrence Clark in 1973. COMEFROM was eventually implemented in the esoteric programming language INTERCAL.

External References

• COMEFROM Information Page (http://c2.com/cgi/wiki?ComeFrom)
• Datamation Article (http://www.fortran.com/fortran/come_from.html)
• Joke Assembler Instruction List Including CMFRM (http://home.online.no/~heberglu/funtext/89.htm)