~2026-2699: /* External links */

2026-01-01T01:53:54Z

External links

← Previous revision		Revision as of 01:53, 1 January 2026
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	* [https://web.archive.org/web/20100717072236/http://public.carnet.hr/~jbrecak/sm.html Self-modifying C code]		* [https://web.archive.org/web/20100717072236/http://public.carnet.hr/~jbrecak/sm.html Self-modifying C code]
	* [https://flint.cs.yale.edu/flint/publications/smc.html Certified Self-Modifying Code]		* [https://flint.cs.yale.edu/flint/publications/smc.html Certified Self-Modifying Code]

			{{Programming paradigms navbox}}

	{{DEFAULTSORT:Self-Modifying Code}}		{{DEFAULTSORT:Self-Modifying Code}}
	[[Category:Programming paradigms]]		[[Category:Programming paradigms]]

imported>Dgpop: /* Compound modification */ don't need to keep repeating OS

2025-10-16T15:20:46Z

Compound modification: don't need to keep repeating OS

← Previous revision		Revision as of 15:20, 16 October 2025
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	====Compound modification====		====Compound modification====
	Prior to the advent of multiple windows, command-line systems might offer a menu system involving the modification of a running command script. Suppose a [[DOS]] ~~script (or "~~batch") file MENU.BAT contains the following:<ref name="Fosdal_2001"/><ref group="nb" name="NB_CHOICE"/>		Prior to the advent of multiple windows, command-line systems might offer a menu system involving the modification of a running command script. Suppose an [[MS-DOS]] batch file, MENU.BAT, contains the following:<ref name="Fosdal_2001"/><ref group="nb" name="NB_CHOICE"/>
	:start		:start
	SHOWMENU.EXE		SHOWMENU.EXE
Line 85:		Line 85:
	CALL ''SOMENAME''.BAT		CALL ''SOMENAME''.BAT
	GOTO start		GOTO start
	Because the ~~DOS~~ command interpreter does not compile a script file and then execute it, nor does it read the entire file into memory before starting execution, nor yet rely on the content of a record buffer, when SHOWMENU exits, the command interpreter finds a new command to execute (it is to invoke the script file ''SOMENAME'', in a directory location and via a protocol known to SHOWMENU), and after that command completes, it goes back to the start of the script file and reactivates SHOWMENU ready for the next selection. Should the menu choice be to quit, the file would be rewritten back to its original state. Although this starting state has no use for the label, it, or an equivalent amount of text is required, because the ~~DOS~~ command interpreter recalls the byte position of the next command when it is to start the next command, thus the re-written file must maintain alignment for the next command start point to indeed be the start of the next command.		Because the command interpreter does not compile a script file and then execute it, nor does it read the entire file into memory before starting execution, nor yet rely on the content of a record buffer, when SHOWMENU exits, the command interpreter finds a new command to execute (it is to invoke the script file ''SOMENAME'', in a directory location and via a protocol known to SHOWMENU), and after that command completes, it goes back to the start of the script file and reactivates SHOWMENU ready for the next selection. Should the menu choice be to quit, the file would be rewritten back to its original state. Although this starting state has no use for the label, it, or an equivalent amount of text is required, because the command interpreter recalls the byte position of the next command when it is to start the next command, thus the re-written file must maintain alignment for the next command start point to indeed be the start of the next command.

	Aside from the convenience of a menu system (and possible auxiliary features), this scheme means that the SHOWMENU.EXE system is not in memory when the selected command is activated, a significant advantage when memory is limited.<ref name="Fosdal_2001"/><ref name="Paul_1996"/>		Aside from the convenience of a menu system (and possible auxiliary features), this scheme means that the SHOWMENU.EXE system is not in memory when the selected command is activated, a significant advantage when memory is limited.<ref name="Fosdal_2001"/><ref name="Paul_1996"/>

144.174.214.39: /* Application in low and high level languages */ switched creating to creation in {'''creation or modification of source code statements'''} for grammar reasons

2025-03-16T15:26:55Z

Application in low and high level languages: switched creating to creation in {'''creation or modification of source code statements'''} for grammar reasons

Show changes

Self-modifying code - Revision history

~2026-2699: /* External links */

imported>Dgpop: /* Compound modification */ don't need to keep repeating OS

144.174.214.39: /* Application in low and high level languages */ switched creating to creation in {'''creation or modification of source code statements'''} for grammar reasons