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- COMEFROM abstract "In computer programming, COMEFROM (or COME FROM) is an obscure control flow structure used in some programming languages, originally as a joke. COMEFROM is roughly the opposite of GOTO in that it can take the execution state from any arbitrary point in code to a COMEFROM statement.The point in code where the state transfer happens is usually given as a parameter to COMEFROM. Whether the transfer happens before or after the instruction at the specified transfer point depends on the language used. Depending on the language used, multiple COMEFROMs referencing the same departure point may be invalid, be non-deterministic, be executed in some sort of defined priority, or even induce parallel or otherwise concurrent execution as seen in Threaded Intercal.A simple example of a "COMEFROM x" statement is a label x (which does not need to be physically located anywhere near its corresponding COMEFROM) that acts as a "trap door". When code execution reaches the label, control gets passed to the statement following the COMEFROM. This may also be conditional, passing control only if a condition is satisfied, analogous to a GOTO within an IF statement. The primary difference from GOTO is that GOTO only depends on the local structure of the code, while COMEFROM depends on the global structure – a GOTO transfers control when it reaches a line with a GOTO statement, while COMEFROM requires scanning the entire program or scope to see if any COMEFROM statements are in scope for the line, and then verifying if a condition is hit. The effect of this is primarily to make debugging (and understanding the control flow of the program) extremely difficult, since there is no indication near the line or label in question that control will mysteriously jump to another point of the program – one must study the entire program to see if any COMEFROM statements reference that line or label.Debugger hooks can be used to implement a COMEFROM statement, as in the humorous Python goto module; see below. This also can be implemented with the gcc feature "asm goto" as used by the Linux Kernel configuration option CONFIG_JUMP_LABEL. A no-op has its location stored, to be replaced by a jump to an executable fragment that at its end returns to the instruction after the no-op.".
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- COMEFROM wikiPageWikiLink Action_at_a_distance_(computer_programming).
- COMEFROM wikiPageWikiLink Action_at_a_distance_(computer_science).
- COMEFROM wikiPageWikiLink April_Fools_Day.
- COMEFROM wikiPageWikiLink Aspect-oriented_programming.
- COMEFROM wikiPageWikiLink Assembly_language.
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- COMEFROM wikiPageWikiLink C2:ComeFrom.
- COMEFROM wikiPageWikiLink Category:Computer_humor.
- COMEFROM wikiPageWikiLink Category:Control_flow.
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- COMEFROM wikiPageWikiLink Concurrent_computing.
- COMEFROM wikiPageWikiLink Concurrent_programming.
- COMEFROM wikiPageWikiLink Continuation.
- COMEFROM wikiPageWikiLink Control_flow.
- COMEFROM wikiPageWikiLink Datamation.
- COMEFROM wikiPageWikiLink Digital_signal_processor.
- COMEFROM wikiPageWikiLink Do_while_loop.
- COMEFROM wikiPageWikiLink Edsger_Dijkstra.
- COMEFROM wikiPageWikiLink Edsger_W._Dijkstra.
- COMEFROM wikiPageWikiLink Esoteric_programming_language.
- COMEFROM wikiPageWikiLink F._X._Reid.
- COMEFROM wikiPageWikiLink Fortran.
- COMEFROM wikiPageWikiLink Go_To_Statement_Considered_Harmful.
- COMEFROM wikiPageWikiLink Goto.
- COMEFROM wikiPageWikiLink INTERCAL.
- COMEFROM wikiPageWikiLink Intercal.
- COMEFROM wikiPageWikiLink Label_(computer_science).
- COMEFROM wikiPageWikiLink Label_(programming_language).
- COMEFROM wikiPageWikiLink Linux_Kernel.
- COMEFROM wikiPageWikiLink Linux_kernel.
- COMEFROM wikiPageWikiLink Michael_W._Shields.
- COMEFROM wikiPageWikiLink NOP.
- COMEFROM wikiPageWikiLink PIC_microcontroller.
- COMEFROM wikiPageWikiLink Parallel_computing.
- COMEFROM wikiPageWikiLink Parameter_(computer_programming).
- COMEFROM wikiPageWikiLink Parameter_(computer_science).
- COMEFROM wikiPageWikiLink Pointcut.
- COMEFROM wikiPageWikiLink Programming_language.
- COMEFROM wikiPageWikiLink Python_(programming_language).
- COMEFROM wikiPageWikiLink Python_programming_language.
- COMEFROM wikiPageWikiLink R._Lawrence_Clark.
- COMEFROM wikiPageWikiLink Richie_Hindle.
- COMEFROM wikiPageWikiLink Ruby_(programming_language).
- COMEFROM wikiPageWikiLink Super_Harvard_Architecture_Single-Chip_Computer.
- COMEFROM wikiPageWikiLinkText "COME FROM".
- COMEFROM wikiPageWikiLinkText "COMEFROM".
- COMEFROM hasPhotoCollection COMEFROM.
- COMEFROM wikiPageUsesTemplate Template:Original_research.
- COMEFROM wikiPageUsesTemplate Template:Reflist.
- COMEFROM subject Category:Computer_humor.
- COMEFROM subject Category:Control_flow.
- COMEFROM hypernym Structure.
- COMEFROM type Article.
- COMEFROM type Building.
- COMEFROM type Article.
- COMEFROM type Concept.
- COMEFROM comment "In computer programming, COMEFROM (or COME FROM) is an obscure control flow structure used in some programming languages, originally as a joke. COMEFROM is roughly the opposite of GOTO in that it can take the execution state from any arbitrary point in code to a COMEFROM statement.The point in code where the state transfer happens is usually given as a parameter to COMEFROM.".
- COMEFROM label "COMEFROM".
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- COMEFROM sameAs Q782979.
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- COMEFROM wasDerivedFrom COMEFROM?oldid=660381258.
- COMEFROM isPrimaryTopicOf COMEFROM.